Ethanol is cheaper than gasoline at the wholesale level:  A gallon of ethanol is currently selling for nearly $1 per gallon less than a gallon of gasoline.  That means a gallon of E10 (gasoline containing 10% ethanol) is $0.10/gallon cheaper than a gallon of conventional gasoline with no ethanol.  If E15 (gasoline with 15% ethanol) blends were available today, they likely would be selling at an even larger discount to conventional gasoline. 5

Increased ethanol use reduces oil demand and prices: Since 2005, the year in which the Renewable Fuel Standard (RFS) was first enacted, America’s oil demand has decreased and national oil import dependence has fallen from 60% to 45%. 

Meanwhile, ethanol has grown from 1% of the nation’s gasoline supply to 10% today.  As the world’s largest oil consumer, extending our oil supply with renewable fuels helps put downward pressure on petroleum prices and keeps them lower than they would be otherwise (this is the effect primarily responsible for the $0.89/gallon savings found by the aforementioned CARD analysis).

Ethanol provides gasoline refiners with a cost-effective source of octane: With an octane rating of 113 (RON), ethanol has considerable value to refiners as a source of octane. Oil refiners and blenders use ethanol to upgrade otherwise unmarketable lower octane sources of gasoline (called sub-octane) to the octane levels required by state law for sale into commerce. Upgrading sub-octane gasoline with ethanol reduces the refiner’s cost of producing gasoline. If low-cost ethanol were not available to refiners, octane demand would have to be met with other higher-cost sources, many of which are toxic in nature.


The factors driving gasoline prices higher are complex and not always transparent. However, there can be no argument that ethanol is playing a significant role in holding gasoline prices lower than they would be otherwise.  It will take a host of solutions to divorce America’s economic future from the vagaries of the world oil market, but ethanol is providing one part of the answer today and can be an even larger part of the solution in the years and decades to come.