The C6.R Corvettes are already equipped to run E85 fuel, but for 2009, Corvette drivers across America will still have only one option: gasoline.

For 2009, General Motors offers 18 FlexFuel models capable of running on E85 ethanol, ordinary gasoline or any combination of the two – more than any automaker.

The models cover the gamut from the four-cylinder Chevrolet HHR small crossover to the full-size Cadillac Escalade ESV luxury utility.

E85, which consists of up to 85 percent ethanol mixed with gasoline, is a cleaner-burning, higher-octane fuel that can help offset rising demand for oil.

“We continue to believe that biofuels, specifically E85, is the most significant thing we can do in the near-term to offset future energy demands,” said Beth Lowery, GM vice president of Environment, Energy and Safety Policy. “We are on target to make 50 percent of our vehicles flex-fuel capable by 2012 providing the infrastructure is in place.”

Infrastructure includes both the availability of the E85 fuel and stations where it is sold. Currently fewer than 1,600 of the 170,000 gasoline stations in the country offer E85, leaving many flex-fuel vehicle owners unable to take advantage of the fuel choice their vehicle offers.

GM cars and trucks account for 3 million of the 7 million flex-fuel vehicles on U.S. roadways and the company produced more than 1 million flex-fuel models in North America and Brazil last year.

Here are the 2009 models GM offers that include flex-fuel capability at no additional charge to the customer:

Chevrolet: Avalanche, Express, HHR, HHR Panel, Impala, Silverado, Suburban, Tahoe 
GMC: Savana, Sierra, Yukon, Yukon XL 
Cadillac:  Escalade, Escalade ESV, Escalade EXT 
Hummer: H2, H2 SUT 
Buick: Lucerne