Does ethanol free gas make any difference?

Spade

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I have a few ethanol-free gas stations around my area and have noticed a slight increase in mpg while running e free gas (Pre Tune). Seems like some other people swear by it on the internet and say that it gives their car better gas mileage as well. I have not heard anyone claim anything about any power gains and I also have not noticed any difference there.

I have Ktuner with phearable stage 1.5 on my 2018 honda civic CVT. I just got the tune and my most recent fill-up was with shell 93. My knock control consistently stays around .49 to .52.

I will be testing to see if the knock c changes on my next fill-up with e free 93 oct gas. In my area the e free 93 octane at shell is cheaper than shell 93.

Anyone have any experience with this yet?
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KTuner

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Adding ethanol to your system will cause the ECU to add fuel to compensate via fuel trims. More injection time, less mpg.
 

chuenoona

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93 octane non-ethanol has the same knock properties as E-10 93 octane.

Only benefit is you should gain 1-2 mpg in fuel economy, because the less the ethanol the better the fuel economy.
Your fuel trims will be off because modern cars are tuned to anticipate around 10-15% ethanol in today’s fuels....
 

Two Step Performance

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Adding ethanol to your system will cause the ECU to add fuel to compensate via fuel trims. More injection time, less mpg.
Agreed. :thumbsup:

93 octane non-ethanol has the same knock properties as E-10 93 octane.

Only benefit is you should gain 1-2 mpg in fuel economy, because the less the ethanol the better the fuel economy.
Your fuel trims will be off because modern cars are tuned to anticipate around 10-15% ethanol in today’s fuels....
Disagreed. :thumbsdown:

You absolutely want ethanol in your fuel mixture with the 1.5T. Added ethanol (beyond 0%) does increase knock resistance. E10 / 10% is a great start, but most people that are going for more performance will further increase the ethanol percentage. 35-40% is the sweet spot. This of course requires an appropriate tune.
 

WhiskeyTango

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Pretty sure non oxygenated fuel is illegal for highway use in nearly EVERY state.
 


WhiskeyTango

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Not sure about that - you may be correct - but the only non-ethanol fuel I use is in my mower and small power equipment.
In most places that you can still find it it is labeled as "Agricultural Use Only"
 

WOPSiWOT

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In most places that you can still find it it is labeled as "Agricultural Use Only"
Not in South Carolina. Why would it be? But yeah I use it for my small power equipment and marine applications. Not the Civic.
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