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Discussion Starter · #1 · (Edited)
I've read in a few places that with a leveling
kit and 35s the EcoBoost will drop in MPG.

Obviously with more drag (lift) & bigger meats
MPG will drop to some extent. But what is the
real world difference? 18 (Screw, 3.5, W/3.55s),
I'm getting between 18.5 - 20 MPG to the tank.

What could I expect to get with a 2.5 level, and
Raptor 17s & 315s. I'd prolly run Factory setup.

I understand level n 35s aren't done for MPG,
But I'm not looking to kill 25% MPG for 315s.
 

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2013 XLT 302A 145" Screw
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Let's all guess. Who here can do better than a guess ? To what end does it matter ? You obviously care about MPG or you wouldn't be here asking. Ooops. Sorry. I meant you obviously don't care about MPG or you wouldn't be raising the nose and adding rolling weight.
I'm guessing 16. 4 mpg hit. I put on 275 70 18 from stock 275 65 18 and took a 2 mpg hit. Stock stance.
 

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I installed 275/65R20 E load rated tires (stock superduty size) with just a level (1.75"). So it was a 2" increase in diameter and approx 20lb increase per tire. City driving, my mileage went from 13 L/100km (18 mpg) to 16 L/100km (14.7 mpg). Highway driving did go from 11 L/100km (21 mpg) to 13 L/100km (18 mpg), but after some time, I found that if I locked out 10th gear on the highway, I was back to 11-12 L/100km on the highway.
 

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you will lose 4 mpg
 

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2013 XLT 302A 145" Screw
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I sure didn't mind increasing the final drive ratio for highway driving but the weight of the LT tires cancelled that out. I also haven't noticed a power drop.
 

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2016 Ford F-150 XLT 2.7 Ecoboost 3.55 Axle
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Let's all guess. Who here can do better than a guess ? To what end does it matter ? You obviously care about MPG or you wouldn't be here asking. Ooops. Sorry. I meant you obviously don't care about MPG or you wouldn't be raising the nose and adding rolling weight.
I'm guessing 16. 4 mpg hit. I put on 275 70 18 from stock 275 65 18 and took a 2 mpg hit. Stock stance.
Lol, all I did was raise the front end 2.5” and got 1 mpg decrease. But I haven’t gone up in tire size yet
 
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I was going to say around 4 mpg also


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I’ll be an optimist and say you would only lose 3.5 mpg with 35’s on it ;)

If you are concerned with MPG and don’t tow heavy/often, I say forget the LT E range tire all together and get the largest LT C range or even Non LT tire that fits your needs. Generally these tires weigh significantly less than their similarly sized LT e range counterparts. In my experiences, the Ecoboost engines are very mpg sensitive when it comes to tire weight/rotational mass.

The power is there all day for 35’s, but those turbos are going to be pushing more boost to maintain the same cruising speed. It’s just the nature of the beast


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