E85

A mix of 85% ethanol and 15% gasoline. It is a common ethanol blend? used in flex-fuel vehicles.

Although common wisdom has it that higher ethanol blends return lower miles per gallon MPG? than gasoline, studies into fuel efficiency and fuel consumption by both non-flex-fuel vehicles and flex-fuel vehicles using higher ethanol blends disprove this.

Vehicles running on E85 also have a reduced carbon footprint, even by comparison to electric vehicles, which in the U.S. are powered primarily by electricity produced by coal-fired power stations. A study by Biofuels Digest found that e85 vehicles have a 30% lower lifetime CO2 than the Tesla roadster.

See:
* Optimal ethanol blend level
* Fuel efficiency from higher ethanol blends
* e85 electric Tesla carbon footprint study

External links:

Government site - lists vehicles and their fuel economy