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Message: <blockquote data-quote="soberups" data-source="post: 532951" data-attributes="member: 14668">Incorrect. A flex fuel vehicle can run on any blend of fuel up to e85, which is 85% ethanol and 15% gasoline. I ran regular gasoline in my '03 Caravan up until 3 yrs ago when E85 became available in my area. I still run it today if I need fuel and i am not at a station that sells E85. My Caravan does not have a higher compression ratio than a non-flex fuel vehicle. Ethanol and methanol both have a far higher octane rating than gasoline which is why top-fuel funny cars use methane instead of gas, and if you run low octane gas in a high compression motor you will cause damage, but flex fuel vehicles arent high compresion.</blockquote>