Every car I have owned gets 2 - 7 more miles per gallon with ethanol free gasoline!
Ethanol will gum more than regular 100% gas also(easier on your engine and gas tank in general)
Most gas stations offer 100% gas AT HIGHER octane than ETHANOL 10% gas so the octane is ACTUALLY BETTER than ethanol! So overall you get what you pay for! 100% (gas = gooder)