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Premium fuel required!?

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What is the issue with ethanol fuel? Is it only a problem in SC cars? We have few stations (only one that I know) that sell 100% gasoline and not mixed with 10% ethanol.
 


Ethanol has less energy per a given volume, so the car might not run as hard on an ethanol mix. I know that E10 drains about 3MPG on the highway on my car as opposed to running 100% gasoline.
 
Sabrewings said:
Ethanol has less energy per a given volume, so the car might not run as hard on an ethanol mix. I know that E10 drains about 3MPG on the highway on my car as opposed to running 100% gasoline.
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Actually, it leans out your fuel mixture a little, the car will correct for this in closed loop, but when running WOT you actually are running leaner than commanded.
 


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