[WardL]

I'm pretty sure all racing gas has more than 10% ethanol. My Flex-Fuel F-150 is made to run fuel with ethanol anywhere between 85% to zero. If you buy E85 with a half tank of E10 your tank will be about 50% Ethanol. The specs show it actually gets more HP with the E85 because the computer can adjust for the higher octane. The issues with running E85 is the parts that touch the fuel have to be made to handle ethanol. I think the flex-fuel vehicles have mostly steel fuel systems. Any rubber is special to handle the high ethanol. Another point of interest, they call it E85. But the ethanol can legally range from about 50% to a max of 85% depending on the season. I suggest to stick with premium gasoline for your Cobra....