Are you refering to E-85? If so we are the unfortunate ones.
Many of GM's vehicles (mostly trucks) will run on E-85. You can look on the window sticker, or often times it will say inside the gas cap, though I guess there isn't such a location on our vehicles
Some places this stuff is 50-70 cents a gallon cheaper
than regular unleaded, which around here often times has 10% corn gas!
E-85 is also over 100 octane though it will give you about 10% less fuel efficiency.