a little math help needed

a little math help needed

This is a discussion on a little math help needed within the F150 Ecoboost Performance forums, part of the F150 Ecoboost Garage category; OK so i was never good in math and hated the class but i know the basics and you guys know the rest so help ...

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  1. #1
    Ecoboost Pro brian351w's Avatar

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    a little math help needed

    OK so i was never good in math and hated the class but i know the basics and you guys know the rest so help me out.
    if i change my fill up from 87 octane to 93 octane with lets just say 20 gal for sake of a nice even number.
    the simple math is .30 cents a gal more in cost and a total of $6 for the fill up overall.
    now for the question part !

    how much more milage would i have to gain per mile to overcome that $6 cost for the 20 gal fill up ?
    and next is it possible even with a custom tune ?
    lets say my avg fuel milage is between 17.5 and 18.4 in stock form with mixed town and highway miles.

    lets see some numbers at work !
    2013 XLT Flame Blue Metallic 4x4

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    Ecoboost Veteran Tremor's Avatar

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    TBH I don't know what the numbers will be, but im pretty sure no matter what your not gonna make up the fuel mileage to make it the same cost as regular. Even with a special tune.


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    Ecoboost Pro brian351w's Avatar

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    thats kinda what im thinking without actually punchin it all up on a calculator !
    i also wondering how much more performance you can really get with the extra timing by running the 91 or 93 on a reg like alot of guys do.
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    Ecoboost Veteran Tremor's Avatar

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    Well your not really gonna get much of a performance gain at all really. It def will not be noticeable as far as that goes. When using lower octane fuel the chance of engine knock is more likely, especially during higher rpms. When knock happens the timing retards, which in turn will give you less power and more fuel consumption. However the EB will run fine on regular.


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    Eco-Beast Grim Reaper's Avatar

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    You don't have enough "variables" defined. You need to state both your cost for 87 and 93. The cost difference only is insufficent.

    Then the formula is simple. $Cost-gallon-93 / $Cost-gallon-87 x AVG-MPG-87.

    For simplicity ... if you 93 Octane costs 10% more per gallon (or per litre ...works both ways), then you must get at least a 10% increase in your overall MPG (kms/litre) to break even.
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    Eco-Beast Raiderfan1890's Avatar

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    This^^ I was going to say this but then there was a little drama on the forum and I got distracted
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    Ecoboost Regular 1fastbob's Avatar

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    Quote Originally Posted by Grim Reaper View Post
    You don't have enough "variables" defined. You need to state both your cost for 87 and 93. The cost difference only is insufficent.

    Then the formula is simple. $Cost-gallon-93 / $Cost-gallon-87 x AVG-MPG-87.

    For simplicity ... if you 93 Octane costs 10% more per gallon (or per litre ...works both ways), then you must get at least a 10% increase in your overall MPG (kms/litre) to break even.
    That won't work as he is from Pennsylvania and you are using Canadian dollars and metric liquid measures. The correct formula for us in the U.S. is....(elevation (in feet) - elevation (in feet)) x (length of gas hose at pump (in feet)) + .05. As you can plainly see in my calculation premium yields a 5 percent increase in MPG, this being less than the increased cost of premium versus regular. Although there is a slight gain in fuel economy and horse power, regular 87 octane is more economical to run.

    Disclaimer: It is currently 1* F here in South Central Kansas and snowing like hell. I am not responsible for what I post today. That is all. There will be NO Corvette driving today.
    scap99 likes this.

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    Ecoboost Veteran RubyTues's Avatar

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    OP, you might want this thread with lots of good information : https://www.f150ecoboost.net/forum/6-...89-91-etc.html
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    Quote Originally Posted by 1fastbob View Post
    That won't work as he is from Pennsylvania and you are using Canadian dollars and metric liquid measures. The correct formula for us in the U.S. is....(elevation (in feet) - elevation (in feet)) x (length of gas hose at pump (in feet)) + .05. As you can plainly see in my calculation premium yields a 5 percent increase in MPG, this being less than the increased cost of premium versus regular. Although there is a slight gain in fuel economy and horse power, regular 87 octane is more economical to run.

    Disclaimer: It is currently 1* F here in South Central Kansas and snowing like hell. I am not responsible for what I post today. That is all. There will be NO Corvette driving today.
    Luckily, I am an old timer that grew up with good ol' Fahrenheit & Gallons, as well I spent a lot of time in the US. I am perfectly bilingual in all measurement systems, including Imperial and Whitworth measurements.
    2013 F-150 4x4 Supercab 145"WB Ecoboost XLT, Group 302A, XTR Trailer Package, E-Lock 3.55s ...
    Bolt-ons Installed:
    Banks CAI, Wagner CAC, Full Race Catted Downpipes, Custom 3" exhaust w/3" Flowmaster dBX Muffler
    Tuned by Torrie McPhail at www.unleashedtuning.com 91+ Octane 535 RWTQ @ 2750 / 372 RWHP @ 4900 - (Mustang Dyno)
    Mods (Waiting): Mishimoto Hardpipes, Tifosi Ported & Ceramic Coated Exhaust Manifolds, Full Race GT Turbos & SPD Ported Adapters



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