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10% ethanol fuel has been a fact of life here for around a decade or more. I tried E0 in my 2011 Fiesta and at 80 cents more a gallon and 60 miles out of the way the mileage needed to increase by a little over 25% at that time when it was pushing $4 a gallon versus $3.20 for regular E10.
In sealed systems I have seen E10 go over a year without issues and my Honda pressure washer started fine after sitting for close to 6 months all with no additives.
E10 is one of the reasons we are importing much less than the 50+% of the crude oil we were importing before the mandates. I am neither and ardent advocate or opponent, and I understand the principles involved in choosing that renewable option, over crude from unpredictable sources.
Most EFI cars have no problem with E10, my 23 year old Sentra runs fine on E10, in fact the cheapest E10 I can find, without a hiccup, but EFI systems are much better equipped to handle the lower energy content than carbs and non feedback systems.
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