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My results agree - around 10% worse FE with 10% ethanol.
Bums me out because I used to be a huge supporter, thinking, "we could use 15% in every gallon we sold, displacing money we were spending on oil into money spent on corn, etc." But now I just wish they would put 100% gas in and charge me 10% more, or just put 10% less in my tank. Why make/use it - making it contributes to fossil fuel emissions, and on my car at least, doesn't even push it down the road.
I guess I do see one reason to use 10% - then they can sell 90% ~84 octane gas to you with the ethanol to boost octane to 87.
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