"Ethanol and fuels like E85. 1.5 gallons of ethanol has the same energy content as 1.0 gallon of gasoline. A flex-fuel vehicle will experience about 76% of the fuel mileage MPG when using E85 (85% ethanol) products as compared to 100%gasoline. ... Pure ethanol provides 2/3 of the heat value available in pure gasoline."

This information according to Wikipedia, show we are better off using Non-ethanol gas. My question is it ok to use in our xfires? I can get mid-grade non-ethanol gas, though only rated at 89 0ctane, I had to sign a disclosure, when I bought the car, that said I would not use any gasoline of less than 89 0ctane. Seem we under-value our gas's octane value by 4 or 5 octane points. If I use it, any chance of damage to my car? Any and all comments welcome.