Class 1 is summertime E85, and needs to have a minimum of 79 percent ethanol (so even E85 doesn't have to be E85). Class 2's ethanol minimum is 74. And Class 3, wintertime ethanol, is 70 percent.

The partnership between GM and the Governor's Ethanol Coalition has been in effect since 2005, and has now been extended to at least finish out 2007. Towards that end, GM has loaned an E85 Chevy ...