Have you ever noticed a pump labeled "Biofuels," or E85? According to the U.S. Department of Energy, there are over 4,000 stations spread across 44 states that offer E85 gasoline. Be aware that ...

The likelihood of accidentally using E85 in a vehicle designed only to run on straight gasoline is pretty damn small, considering the difficulty of even intentionally encountering an E85 pump.

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.