Ethanol: Fact vs. Fiction

Ethanol is a powerhouse for American farms, fuels American vehicles, and has strengthened America’s economy for decades, but remains one of the most misunderstood fuels on the road today.

Maybe you’ve seen claims like ethanol damages engines, steals food from people’s plates, is bad for the environment, or isn’t worth the gas mileage trade-off.

Most of these claims are outdated, wrong, or missing the whole picture.

Let’s break down six common myths.

Myth #1: Engine Damage

“Ethanol damages car engines.”

Facts:

• All vehicles made since 2001 are compatible with E10 (10% ethanol) by design
• E15 is EPA-approved for model year 2001+ vehicles and has logged billions of miles without engine issues
• Ethanol’s higher octane can reduce engine knock

Myth #2: Food vs. Fuel

“Ethanol takes food off people’s plates.”

Facts:

• Ethanol only extracts the starch from field corn — the remaining protein and fiber return to the food supply as animal feed (DDGS)
• Every bushel used for ethanol still produces ~18 lbs of DDGS
• U.S. corn production consistently exceeds domestic demand, with 18% exported internationally

Myth #3: Carbon Footprint

“Ethanol is just as dirty as gasoline.”

Facts:

• Lifecycle greenhouse gas (GHG) emissions from corn ethanol are 44-52% lower than gasoline, according to USDA and Argonne National Laboratory research
• Growing corn absorbs CO2
• Modern biorefineries run on renewable energy

Myth #4: Fuel Economy

“Ethanol tanks your gas mileage.”

Facts:

• E15 reduces miles per gallon (MPG) by only 1-2% compared to E10 – an imperceptible difference in daily driving
• E15 and E85 cost less per gallon, so your cost-per-mile often decreases
• Flex-fuel vehicles are optimized to fully offset any MPG gap

Myth #5: Energy Balance

“It takes more energy to make ethanol than you get out.”

Facts:

• Corn ethanol has a positive energy balance of 2.3:1, meaning it delivers more than twice the energy needed to produce it
• Advanced biorefineries and precision agriculture have steadily improved this ratio



Myth #6: Economic Impact

“Ethanol only helps corn farmers—not regular people.”

Facts:

• Ethanol lowers prices at the pump for everyday drivers by increasing fuel supply and blending the cheapest and cleanest octane into gasoline
• Studies estimate ethanol saves consumers $0.30–$1.00+ per gallon
• Supports 400,000+ U.S. jobs and keeps rural economies strong