In October, the EPA approved an increase in the percentage of Ethanol allowed in gasoline from 10% to 15%. Does this change put your car's engine in the Red Zone? Check out this article from Bloomberg:
/www.bloomberg.com/news/2011-01-21/u-s-epa-said-to-allow-15-ethanol-fuel-mix-for-cars-made-in-2001-or-later.html