i may have misunderstood, but i think some get 2 things confused... E85 is 85% ethanol and the rest gas, this can be used in some vehicles, but usually only if they are classified as dual or flex fuel. the up to 10% stuff is actually e10. e10 is designed to be run in vehicles that are labeled as unleaded fuel only. Here in Oklahoma City most of our stations dispense e10 (you will see a sticker on the pump that says may contain up to 10% ethanol.) i personally will not use that in any car unless i have no other option.
In the last few years since they have been pushing e10 i have run it in my 06 dodge ram v6, 96 Chevy lumina v6, 2002 ford f150 v6, 2006 ford f150 v8, 2008 Chrysler sebring convert 2.4l 4cly and my 09 cube and with every vehicle running e10 has created a rough idle, a marked difference in acceleration, lower mpg, and even hesitation when accelerating. who knows what all else is going on inside the engine.
E10 has been pushed alot latley here becausee it is cheaper than normal unleded. however i have done the math and alltho i dont have the numbers, i do remember they werent good for e10.here is what i did; try it yourself and let us know:
i filled up with a tank of the e10, and tracked the millage.
once that thank was gone, fill up with regular unleaded and track the millage
then take the $$ amount it cost to fill up with the e10 and divide by the # of miles you got, this will give you the cost per mile, then do the same with unleaded.
what i found was that altho the e10 is on average about 10 cents less per gallon i also got lower mpg which resulted in a higher cost per mile than the unleaded fuel. add that in with extra wear and tear on the motor and well... i just stick with the manufacturer recommended unleaded fuel.
Again, I'm an computer expert, not a car or a gas expert so don't take my word for it and definably correct em if I'm wrong on anything.