The latest average cost for a gallon of gas nationwide, as reported by AAA, is $3.88, but it would already be $4.00 a gallon without ten percent ethanol.
According to the Renewable Fuels Association (RFA), based on current market conditions and federal renewable fuels policy, 10 percent ethanol blends (E10) are keeping gasoline prices $0.12 per gallon cheaper than they otherwise would be.