Short trips, winter fuel, possibly a lot of warm-up idling, lower octane rated fuel, etc. may and will all contribute to the lower MPG. Keep tracking the MPG by hand to see impacts as you get out of the winter blended fuel.
I would suggest you try a higher octane rated fuel as well. We have anecdotal comments here on the forum that some folks get better MPG with higher octane rated fuel.

Have you taken the truck on any long highway trips and seen an increase in MPG?

 

If youre just driving around town and never getting the thing up to temperature then I am not surprised. It takes my truck >30 minutes driving at 55 mph most of the time to get the transmission near operating temperature.

I lose nearly 15% mpg in the winter. Summer I was ~18, winter I would be around 16.

 

Winter, short trip, 87 octane...all will contribute to the lower mpg. I lose 1 mpg using 87 instead of 93. Anecdotally, using lower octane may also result in greater fuel dilution, so be sure to use a good quality oil and keep your oil change interval short. The biggest improvement is generally use of the right foot. If you can stay under 2,500 RPM, you'll be bored, but your mpg will improve by reducing time spent in boost.

 

There are a couple recurring themes to inquiries around here.

"I thought my MPG would be higher" is definitely one, and understandable since many folks are attracted to the "Eco" part of the engine name.

But to me "Eco" refers to what is possible only under ideal conditions - fully warmed up, on the highway, good gas, staying out of the boost & off the hills.

Outside of those conditions, it gets just as bad MPG as any engine does that makes similar power while pulling a similar weighing truck.

Then in winter, lots of idling and winter gas make it terrible.

My own non-towing MPG range has been 11.5 - 19.5.

 

Outside of those conditions, it gets just as bad MPG as any engine does that makes similar power while pulling a similar weighing truck.

My own non-towing MPG range has been 11.5 - 19.5.

Mine has never been a MPG machine. If I have a tailwind I can run 75mph and get 16mpg. If I keep under 70mph I might see 17mpg. The only time I got good mileage is when I was following my daughter's school bus (ok more like drafting) going only 60mph and my distance to empty actually kept getting higher for the 2 hour trip. Final mpg on the digital readout was something like 24.

I do agree with a lot of other here. Short, city (stop/go) trips will just kill the MPG and, dare I say, these engines. They need to be warmed up - as do most modern vehicles.

 

I wittingly sacrifice a couple of mpg for the shear joy of being the pacesetter on my daily commute rather than the pace follower.

It's from decades of street riding on motorcycles and avoiding being boxed in at almost all cost. I can't shake the call, if you know what I mean.

It's why I'm the bullseye for the Ecoboost F150 customer. I'm not exactly a Boost launcher or anything like that, but I absolutely will roll into a 17psi maneuver to get some space between me and the perceived threats.

I'm thrilled with how the jekyll/Hyde personality disorder of these trucks provide a nice balance for performance/economy.

 

Drafting a bus is fun if the kids in the back are hilarious. They are supposed to be, after all.

 

Thanks everyone for all your input. All the points made are well taken and understood. I am aware of all that you have said that can detract from good mpg especially during winter. Most of my driving is short commute to and from work about 4 miles each way with a lot of start/stop. Not too much highway driving. I keep RPMs 2000 or less almost at all times except initial take off from stop sometimes. It just seems like despite all the negatives of winter, that I should do a little better than 12MPG at best. I do have a Leer cap on the back of the truck I just added last fall. From reviews I have seen about having a cap, it does not make a huge difference in MPG-maybe 1mpg less. I just have a sense that there may be something off in the tuning of my engine creating such low mpg. I will keep checking and see what happens when I get out of winter months.

 

I keep RPMs 2000 or less almost at all times except initial take off from stop sometimes.

Indeed, scenarios you described are about worst case unfortunately, and to me, corroborate your reported mileage.

Anymore, my wife basically only does runs to the school drop off and grocery store, both less than 2 miles away, and is lucky to get 20 mpg from her compact economy car in the winter.

Anyway, one of the only differences between your ecoboost and similar NA engines is that at lower rpms the engine can use more boost and therefore fuel than it might at higher rpms, and vs a comprable NA motor at the same RPM.

No exact science or guarantees, but you might see slightly better mileage if you use the transmission gear selector to limit gears to keep RPMS actually above 2k. Driving in Sport mode is similar. May also help with warming up?

But even if so, it may not be enough difference to warrant the hassle.

 

12 doesn't seem out of the norm with winter fuel, short trips, and stop n go.

 

I mean, 12 mpg stinks, but you just described the absolute worst case mpg scenario - 4 mile trips in winter. Not even close to fully warmed up by the time you are already shutting it off. Even an economy sedan would struggle to stay above 20 in those conditions.

What gas station do you regularly use? Is it top-tier gas?

I don't think your leer cap will hurt mpg much at all, to be honest. As long as its not a high rise cap that increase the effective frontal area of the vehicle.

Do you park inside a garage at night? I think we could all benefit from block heaters, to pre-warm the engine before starting our commutes. I'm not looking forward to draining my coolant to install one myself, but I guess it's a good excuse for a coolant flush.

 

Thanks Mulyhuntr and RuggedGoods for the input.

Top-tier gas is an interesting topic. Does anyone know of a reliable resource that reviews and compares gasoline companies with well defined parameters to compare apples to apples with each gasoline product?

My Leer cap is level with top of cab, not extended height.

Parking in garage not an option for me at this time. Engine block heater interesting consideration now that you mention it and so many comments about the importance of a warm engine. I have always thought of the necessity of a block heater for diesel engines in the winter but not so much a gas engine.

I am also beginning to wonder if being a turbo contributes to winter MPG loss too. Would a naturally aspirated engine perform better in winter like the 5.0 Coyote or 5.3 /6.2 GM engines or Ram V6 or V8? The Ram Hemi seems to always be top of the pack for guzzling gas but probably would still beat my 12mpg 3.5L ecoboost turbo in the winter.

I appreciate all the feedback from everyone.

 

If you were to cruise the forum and come across the mpg posts regarding the Powerboost F150, it might create fuel economy envy.
But if you were to ask those same fellas posting 24-27mpg screenshots to post a screenshot at only 4 miles into a winter (<40F) coldstart commute?

I've seen mine in the 11-15mpg range at that point.
It's just a big fat heavy coldstart Twin Turbo 3.5 Ecoboost at 3 or 4 miles.

 

I'm still learning the fuel economy patterns of my '19 3.5 ecoboost. But it seems like the first 3-4 miles in winter cold I am in the 10-12 mpg range, but then it quickly moves up to the ~18 mpg range after that once warmed up. All suburb/country cruising for me.

 

See?
You are just as fuel efficient as a Powerboost for the first 3-4 miles.
You don't need no stinkin "most unreliable truck in America" when you already have the second most unreliable truck in America. 🤣

Sorry, just couldn't resist.

The Ecoboost gets some crazy negative press. It's really the King of the 1/2 ton world, much to the chagrin of so many. 😁

 

hahaha. Whats your PB lifetime avg? I know you drive fast sometimes. But I'll use your avg as my summer time full-tank mpg goal.

 

Trip 1 is lifetime.
12,xxx miles currently
It's at 21.0
It's been as high as 21.3 but dropped during the winter.

Of course it includes my towing miles (utility trailer, NOT RV) and my Interstate 10 trips to San Antonio and back to see my dad. A Powerboost is just an Ecoboost on Interstate 10. Lol

 

You're driving a $50K truck and complaining about $2.20 per day in fuel. Not something I'd lose sleep over or even consider trading trucks over. Even a jump to 16mpg saves you only $.58/day....not something someone in a $50K truck should be fussing about.

 

I am new to the forum. I joined to learn from other F150 owners who might have more detailed knowledge about F150 ecoboost engines and automobile engines in general. In particular I was trying to see if anybody with some significant knowledge about how these engines work thought my wintertime 12mpg might be out of the range of normal and should I really seek a service call to have the truck evaluated for a problem. While it was the recent surge in gas prices that had me start manually checking my mpg, the cost of fuel was not my concern. I did not bring this issue to the forum to "complain" about gas prices or low MPG. I get I am driving a $50K truck and that is not an issue for me either. I could afford a $100K truck if I wanted to but would never spend that kind of money on a vehicle. I also would not begrudge anyone who would buy an expensive vehicle. It's all personal choice.

If I have offended anyone by my questions I apologize. I did not mean to tick anybody off.

I truly appreciate all the the advice shared.

I have put some of the advice into action. Interesting when "Upshifter" suggested manually shifting truck or run in sport mode, I started running in sport mode yesterday and I also started my car with car starter to warm engine before driving and I saw my dashboard mpg read out move from 13.2-13.5 to 14.2. Not that significant but a bit of a change. I realize starting the car to let it warm up loses mpg for me too but driving a warm engine makes a lot of sense. The Turbo should also perform better in cold weather too since there will be more oxygen in the exhaust gas going through the turbo which will enhance performance compared to summertime when increased heat will decrease oxygen thus lowering turbo performance.

After all your input (and thank you all), I am convinced that I don't have a "broken" truck. It seems to me this is normal for the cold weather performance of the ecoboost in a truck not kept garaged and warm overnight. Will probably put an engine block heater on my next F150 and will be going with another ecoboost.

You all have a good weekend.

 

Took a few pics this morning to illustrate the variation that folks can experience between identical trucks, but different driving circumstances.

There's a percentage of folks that purchase a truck based on the fuel mileage that others report, only to be disappointed when they get completely different results. So let's say that you see multiple fellas getting 22, or 23, or more with their truck. I do consistently.

You purchase the same truck and you are getting 16 or 17?

This is what I was at 3 miles into the drive this morning:

Note the 12 minutes. If it wasn't for the ~6 minutes that I spent talking to my daughter as I passed by her heading out, the mileage actually would have been worse at 3 miles. Those 6 minutes gave the truck time to both charge up the battery, which afforded the 1.1 mile of EV, and to get the coolant up to temp much earlier in the trip.
Also it was 75F. In winter temps and no 5 minute warmup, the 14mpg would have been 10-12mpg.

You should hear the gnashing of teeth by the guy getting 12-14mpg out of his Powerboost. You can't convince him that he doesn't have a lemon.

Because the coolant is warm, the next mile is 50% EV. What a difference 1 more mile in your commute can be if we are talking 3 VS 4 miles.

So would if your daily commute was 10 miles instead of 3?
I suspect that the difference would be phenomenal regardless of whether it's a 3.5 Ecoboost or a Powerboost. 10 miles is a world of difference from 3.

Here is the end of my daily commute TO the office on a typical mild weather day.

Same commute home tonight, except I worked late, so it appears that the much lighter traffic coming out of Houston resulted in a better overall flow, if you will.
(I do take a little shorter route home than I usually do going because of habit)
Shear coincidence that the total trip time was almost identical. The conversation with my daughter was matched by a choochoo train on the second leg today.

Point is, short trippers are often underestimating the impact on fuel economy. And I also believe they could be affected by fuel dilution at a much higher rate too.

It takes more fuel and more oil changes and more maintenance overall to have the convenience of that really short ride to the office.

 

My truck is a '20 3.5 also. Granted I am 2WD, and I live in Florida which is warm and flat so that helps. My dash tells me I average 21.7 MPG. Before I drive it I always let it idle for 4 or 5 minutes. I, like most of our friends here love to let the turbos sing so I by no means baby my truck so I do get on it. My last hand calculation was 21.4 MPG. That's a lot of miles and smiles per gallon.

I have 3.55's and do 75% of my driving "in town" I use nothing but Shell 93 gas. The wallet doesn't like it but the truck does.

 

As already mentioned it's definitely normal. I have a ~10 mile commute to work and my economy is pretty abysmal (12-13) when I first leave the house but is pushing 20 by the time I get to the office.

 

2 different "First 3 miles" from the same truck.
One was the coldstart I posted earlier.
The other is a warmstart.

World of difference.
That's why internet comparisons without context can be so misleading.

 

My average since coming back from the mountains in the middle of the summer is 14.6 mpg. Haven’t reset it, do a lot of highway miles and short trips in town. Idling kills mileage fast. I live in a arctic wasteland in the winter. I can get 18 mpg on highway trips in the winter once I’m warmed up.

If you have a way to monitor boost. Try and keep the truck out of boost. Boost is the enemy for fuel economy. These trucks are happy reving. I run my truck in different drive modes or lockout top gears when the truck is in constant boost. Your just glowing fuel economy out the tail pipe. I think my truck spends more time in 8th or 9th gear on the highway at 70 mph then it does in 10th.

Do you know what rear axle gearing is in your truck?

 

I have a '20 3.5 as well. I noticed an improvement in MPG's once I got a 93 octane tune. It also made it a lot more fun to drive.

 

I kept a mileage log since I bought the truck used. 2018 F-150 SuperCab 4X4 3.5 EcoBoost w/ Max Tow Package. I know, TMI... (Edited to say USED - I bought it used, not new.)

Date	Mileage	Miles Traveled	Trip Odometer	Miles to Empty	Miles to Empty After Fill	Gallons	MPG	Truck Indicated MPG	Difference	Hours:	Hours/Gal	Engine Hours	Idle Hours	Octane	Price	Cost	Location	Notes
11/22/2019		497.7				32.390	15.37	?						93	$2.879		Sam's	Around Town
11/29/2019		173.1				9.645	17.95	18.7	0.75					93	$3.159		Giant McConnellsburg	Trip
12/3/2020		175.2				8.901	19.68	20.1	0.42					93	$2.939		Sam's	Trip
?		425.3				28.398	14.98	16.4	1.42					93	$2.829		No Receipt	Around Town
12/21/2019		446.2				30.585	14.59	?						93	$2.839		Sam's	Around Town (Had steel plates in bed)
1/18/2020		317.7				18.084	17.57	?						93	$2.839		Fredricksburg, VA	Trip
1/18/2020		521.4				29.600	17.61	?						93	$3.399		Shell Savannah, GA	Trip
1/21/2020		478.3				28.281	16.91	18.4	1.49					93	$3.149		7-11 Ft. Myers	Trip
1/21/2020		430.9				31.959	13.48	14.3	0.82					93	$3.359		Shell Richmond Hill, VA	Towing Car from Florida
1/21/2020		369.5				29.286	12.62	13.5	0.88					93	$3.199		Battleboro, NC	Towing Car
1/22/2020		415.8				29.923	13.90	14.5	0.60					93	$2.819		Sam's	Towing Car
2/7/2020		349.4				23.537	14.86	16.1	1.24					93	$2.749		Sam's	Around Town
2/27/2020		373.7				24.185	15.45	16.7	1.25					93	$2.679		Sam's	Around Town
3/16/2020	28,183.6	316.2				20.900	15.13	?	#VALUE!					93	$2.599		Sam's	Around Town
3/24/2020		158.9				10.550	15.06	16.2	1.14					93	$2.289		Sam's	Around Town
4/14/2020		433.8				27.006	16.06	17.1	1.04					93	$2.199		Sam's	Around Town - A lot of rain.
5/11/2020	29,273.1	496.7		44		31.262	15.89	16.8	0.91					93	$2.199	$68.75	Sam's	Around Town + Trip to Valley Forge
6/12/2020		486.4		30		32.392	15.02	16	0.98	20:11:16				93	$2.289	$74.15	Sam's	Around Town
6/29/2020	30,199.9	440.3		79		29.760	14.80	15.7	0.90	17:08:27				93	$2.299	$68.42	Sam's	Hauled 2 loads dirt, had in bed a while
7/7/2020	30,733.9	534.0		34		28.620	18.66	17.3	-1.36	13:45:38				93	$2.259	$64.65	Sam's	Had dirt in bed part-time, then trip to farm. Pump shut off early?
7/31/2020	31,102.3	368.4		78		29.218	12.61	15.8	3.19	14:18:42				93	$2.349	$68.63	Sam's	Around Town - Pump must have shut off early last time.
8/27/2020	31,501.3	389.9		122		23.893	16.32	16.1	-0.22	16:11:55				93	$3.139	$75.00	Lukoil	Around Town
9/28/2020	32,387.3	510.3		44		32.255	15.82	16.6	0.78	16:51:00				93	$2.369	$76.41	Sam's	Around Town
10/17/2020	32,915.9	528.5		40		32.034	16.50	17.4	-15.71	18:49:03				93	$2.369	$75.89	Sam's	Around Town
11/11/2020	33,372.7	456.8		62		30.218	15.12	16.3	1.18	18:10:03				93	$2.339	$70.68	Sam's	Around Town
11/27/2020	33,677.1	304.4		235		20.426	14.90	16.5	1.60	12:20:13	0:36:14			93	$2.339	$47.78	Sam's	Around Town - Filled up on way to farm for Deer Hunting.
12/1/2020	34,218.9	541.7		65		30.814	17.58	18.7	1.12	14:04:52	0:27:25			93	$2.339	$72.07	Sam's	Trip to farm hunting and back on one tank. Includes driving around on mountaiin and at farm.
12/12/2020	34,703.1	484.2				31.055	15.59	17.1	1.51	12:52:00	0:24:52			93	$3.199	$99.34	Giant McConnellsburg	Trip to farm to pick up meat, some hunting for the day.
12/24/2020	35,145.3	442.1		90		28.519	15.50	17.1	1.60	13:28:33	0:28:21			93	$2.429	$69.27	Sam's	Some 4-wheel - In to plow snow.
1/20/2021	35,549.8	404.4		98		27.686	14.61	16.2	1.59	16:37:40	0:36:02			93	$2.549	$70.57	Sam's	Around Town
2/9/2021	35,928.3	378.4		106		26.802	14.12	16.1	1.98	15:38:11	0:35:00			93	$2.669	$71.53	Sam's	Two Snow Storms, some 4-wheel drive. Plowed twice.
2/19/2021	36,215.3	287		236		19.829	14.47	16.2	1.73	11:23:50	0:34:29			93	$2.679	$53.12	Sam's	Snow Storms, some 4-wheel drive. Plowed.
3/15/2021	36,640.6	425.3		89		28.664	14.84	16.6	1.76	16:23:56	0:34:20			93	$2.949	$84.53	Sam's	Around Town - Cold, used remote start.
4/5/2021	37,061.3	420.7		108		27.272	15.43	16.7	1.27	15:59:42	0:35:11			93	$2.989	$81.52	Sam's	Around Town - Cold, used remote start.
4/29/2021	37,475.9	414.6		111		26.742	15.50	16.4	0.90	16:10:33	0:36:18			93	$2.999	$80.20	Sam's	Around Town
6/1/2021	37,906.1	430.1		106		27.189	15.82	16.6	0.78	13:32:17	0:29:53			93	$3.149	$85.62	Sam's	Around Town - Hauled a load of mulch.
6/14/2021	38,407.4	501.3		37		31.476	15.93	16.6	0.67	20:03:37	0:38:14			93	$3.149	$99.12	Sam's	Around Town - Hauled a load tree branches.
7/14/2021	38,851.2	443.8		77		29.334	15.13	16.3	1.17	17:56:59	0:36:43			93	$3.229	$94.72	Sam's	Around Town, mostly with ECO off. Added 3 cans of Seafoam to full tank.
8/11/2021	39,377.2	526.0		29		32.593	16.14	16.6	0.46	19:54:32	0:36:39			93	$3.269	$106.55	Sam's	Warning light came on at 50 miles to empty.
8/30/2021	39,885.4	508.1		26		32.335	15.71	16.4	0.69	19:08:18	0:35:31			93	$3.279	$106.03	Sam's	Around Town, mostly with ECO off.
10/4/2021	40,292.1	406.7	406.4	151		24.976	16.28	17	0.72	16:10:55	0:38:52			93	$3.349	$83.64	Sam's	To Valley Forge bike trail.
10/21/2021	40,733.7	441.6	441.5	113		27.578	16.01	17.2	1.19	17:50:20	0:38:49			93	$3.749	$103.39	Sam's	Around Town
10/24/2021	41,230.8	497.1	497.1	130		27.311	18.20	18.8	0.60	10:53:22	0:23:55			93	$3.749	$102.39	Sam's	To farm and back on one tank. ( Senior deer season.)
11/11/2021	41,621.5	390.7	390.7	114		26.157	14.94	15.9	0.96	18:04:56	0:41:29			93	$3.779	$99.37	Sam's	Local - Some Turnpike
11/26/2021	42,041.4	419.9	419.9	590 ?		26.518	15.83	16.8	0.97	16:53:55	0:38:14			91	$4.059	$107.64	Wawa Virginia Drive	Starting trip out to farm.
12/2/2021	42,579.8	538.4	538.4	17		33.035	16.30	17.3	1.00	13:34:50	0:24:40			93	$3.759	$124.18	Sam's	Hunting trip to farm and back plus 1 day local.
12/28/2021	43,071.9	492.1	492	20		32.273	15.25	16.5	1.25	18:56:51	0:35:14			93	$3.699	$119.38	Sam's	To I-fly.
1/13/2022	43,470.7	398.8	398.8	61		29.417	13.56	15.3	1.74	17:18:36	0:35:18			93	$3.629	$106.75	Sam's - not sure if it cut off early.	Cold weather - Lots of remote starts.
2/1/2022	43,913.6	442.9	442.8	46		30.841	14.36	16.1	1.74	18:02:30	0:35:06			93	$3.659	$112.85	Sam's	Cold weather - Lots of remote starts.
2/17/2022	44,256.3	342.7	342.6	155		23.722	14.45	16.1	1.65	14:11:19	0:35:53			93	$3.799	$90.12	Sam's	Cold weather - Lots of remote starts.
3/3/2022	44,631.5	375.2	375.2	157		23.994	15.64	16.7	1.06	14:42:23	0:36:47			93	$4.069	$97.63	Sam's
3/29/2022	45,131.2	499.7	499.7	26		31.999	15.62	16.7	1.08	21:14:01	0:39:49	1,501	266	87	$4.159	$133.09	Sam's	Cold weather (Back down to the 20's!)- Lots of remote starts.
5/4/2022	45,564.2	433.0	432.9	82		28.804	15.03	16.1	1.07	19:52:21	0:41:24			87	$4.249	$122.39	Sam's
6/1/2022	46,091.3	527.1	527.1	40		31.756	16.60	17.3	0.70	21:01:37	0:39:44			87	$4.739	$150.49	Sam's
7/9/2022	46,581.2	489.9	490.2	41	574	31.743	15.43	16.3	0.87	19:21:32	0:36:36	1,561	279	87	$4.569	$145.03	Sunoco - St. Rd by Giant	Hauled topsoil
7/25/2022	46,779.4	198.2	197.8	370		13.499	14.68	15.8	1.12	8:34:51	0:38:08			87	$4.299	$58.03	Sam's	Topped off before Conference.
9/8/2022	47,215.7	436.3	436.3	116		27.478	15.88	16.8	0.92	16:57:40	0:37:02	1,587	285	87	$3.689	$101.37	Sam's	First fill-up after new cam phasers installed.
10/30/2022	47,665.2	449.5	449.5	89		27.345	16.44	17	0.56	17:38:01	0:38:41			87	$3.659	$100.06	Sam's	Prior to Hunting Club Trip. Not driven lately due to shoulder surgery.
11/1/2022	48,058.9	393.7	393.6	213		22.344	17.62	18.7	1.08	6:41:40	0:17:59	1,611	289	87	$3.699	$82.65	Sam's	After trip to Hunting Club meeting.
11/21/2022	48,473.4	414.5	414.5	95		27.329	15.17	16.2	1.03	12:17:28	0:26:59	1,629	292	87	$3.839	$104.92	Sam's	Cold weather, some remote starts.
12/17/2022	48,970.9	497.5	497.5	15		32.491	15.31	16.8	1.49	20:27:56	0:37:48	1,649	296	87	$3.289	$106.86	Sam's	Cold weather, lots of remote starts.
12/27/2028	49,423.4	452.5	452.5	49	566	30.068	15.05	16.5	1.45	15:43:12	0:31:22	1,665	299	87	$3.099	$93.18	Sam's	Cold weather, lots of remote starts.
1/17/2023	49,899.9	476.5	476.4	31		31.474	15.14	16.5	1.36	18:15:25	0:34:48	1,683	302	87	$3.249	$102.26	Sam's
1/30/2023	50,312.8	412.9	412.9	97	558	27.146	15.21	16.4	1.19	16:27:35	0:36:23	1,700	305	87	$3.499	$94.98	Sam's
2/22/2023	50,807.9	495.1	495.1	18	582	32.064	15.44	16.7	1.26	20:14:27	0:37:53			87	$3.329	$106.74	Sam's	Cold weather, lots of remote starts.

 

I kept a mileage log since I bought the truck new. 2018 F-150 SuperCab 4X4 3.5 EcoBoost w/ Max Tow Package. I know, TMI...

Pretty cool record keeping. I applaud you!

 

Higher octane doesn’t improve my MPG either.

 

To the experimenter's credit unlike most ICE automobiles it is theoretically possible to improve MPG with higher AKI (not "octane", you can not afford to purchase real 87% octane) with the EcoBoost. Ford really retunes correctly (O.A.R.) to accomodate the fuel. But there is a reason 87 AKI is the standard base fuel: that is where the most benefit is found.

 

Been using reg since new.

10.4 L / 100 KM = 22.6 mpg US = 27.2 mpg CDN on a recent 3 hr trip @ 62 mph (and it was still going down ie improving--at that time).

 

As you can see, I never got mileage that good, but I live in a suburb of Philadelphia, so there is a lot of traffic. Even on a trip I don't get that kind of mileage, but the most important factor regarding mileage is the right foot, and mine is a little heavy! And I just can't stay under 80 mph on the open highway...