E85 is blend of 85 percent ethanol and 15 percent gasoline. Its benefits include reduced emissions of greenhouse gases and a reduced dependence on petroleum. GM is the leader in E85 production models, with more than 2.5 million E85-capable cars, trucks and SUVs on the road – with more on the way. Chevrolet offers seven E85-capable models in 2008.
Reduction in greenhouse gases, which isn't a problem, isn't true unless you neglect the agricultural part producing ethanol.
Reduction is dependence on petroleum isn't true either. We consume more energy growing, fermenting and distilling ethanol than we get out of burning it. This actually makes us more dependent on petroleum not less....