[Lazarus]

Originally Posted by Arminius

Going above 10% ethanol risks damage to your car, unless it is made to burn e85. Also, ethanol is not an efficient fuel, so you'll probably get a 25% reduction in FE in percentage of ethanol volume.

http://www.consumerreports.org/cro/c...anol_ov1_1.htm

That's not necessarily true. MN is going to E20 soon. Brazil has had E20 for a long time. I've seen and have seen others get increase in FE with mixtures of E15. Here's a thread on it also check out this page.

You'll be fine with the a couple of gallons of E85 but if the mixture gets over E50 the mileage does start to drop pretty quickly.