I'm looking around online and finding a lot of scary stories regarding voided warranties, etc. My owner's manual says not to use anything above 10% ethanol... but my owner's manual was written in 2007, when 15% ethanol wasn't available. The EPA says any car built after 2001 is ok, and there has supposedly been a lot of government testing done... BUT the EPA and the corn growers are probably in cahoots. I'm not sure if I can trust the EPA's "a-ok." Like I said, the stuff is labeled 88 octane, which is better than the 87 I use now. And it's cheaper. So... higher octane plus lower cost... I'd really like to try the stuff, but I'm afraid it'll harm my car somehow.