How E85 Ethanol Flex Fuel Works

Drivers jumping on the latest gas-saving bandwagon may be in for a shock when they see fuel-economy estimates for the newest darlings of Detroit: E85 ethanol flex-fuel vehicles. Run a new V6 Chevrolet Impala on good-old gasoline, and it'll get 21 miles per gallon in the city, 31 on the highway, according to Environmental Protection Agency (EPA) estimates. Burn E85 -- a blend of 85 percent of the… » Full Story on HowStuffWorks