Image Credit: Reuters
With fuel prices surging well past $4 per gallon for the first time in years (and over $8 per gallon in parts of California), American drivers are once again feeling the squeeze at the pump. The spike has been driven largely by the ongoing conflict in Iran and the effective closure of the Strait of Hormuz, a critical chokepoint responsible for roughly 20% of global oil shipments. While the US does have plenty of oil reserves, onshore refineries are not set up to process that oil; therefore, imports are critical.
With no end in sight to the current situation in the Middle East, crude prices are continuing to climb, causing the US government to turn to a familiar lever in an attempt to stabilize costs: ethanol-blended gasoline.
Fuel From Corn
For most drivers, ethanol is nothing new. E10 has been used as standard fuel across the United States for decades, a blend of 90% gasoline and 10% ethanol. Introduced widely in the early 2000s as part of renewable fuel mandates, E10 was designed to reduce emissions and decrease reliance on imported oil. Ethanol itself is an alcohol-based fuel, typically derived from corn in the US, though it can also be produced from sugarcane and other plant materials. Its appeal lies in its domestic production and renewable nature, making it both an agricultural and energy policy tool.
Now, in response to rising prices, the Environmental Protection Agency (EPA) has issued an emergency waiver allowing the expanded sale of E15 fuel—a blend containing 15% ethanol. Normally restricted during the summer months due to concerns about evaporation and smog formation, E15 is being temporarily approved nationwide to increase fuel supply and lower costs.
The initial waiver runs for just 20 days starting on May 1st, though it is widely understood that this would be extended depending on market conditions at that time.
The logic is simple: ethanol is generally cheaper than gasoline, and increasing its share in the fuel mix reduces the overall cost per gallon. In some markets, E15 has been reported to sell for 20 to 30 cents per gallon less than standard fuel. By allowing more of it into the supply chain, regulators hope to ease pressure on both refiners and consumers.
What’s the Impact?
For modern vehicles, the shift to E15 is largely a non-issue, as most cars built after 2001 are approved to run on E15 without modification. Performance differences are minimal, though there is a slight trade-off in fuel economy. Ethanol contains less energy per unit volume than gasoline, meaning drivers may see a small drop in mileage. On the flip side, ethanol has a higher octane rating, which can help prevent engine knock and, in some cases, improve performance under load.
Where E15 becomes more problematic is with older vehicles and small engines. Carbureted engines found in classic cars, motorcycles, and small equipment like lawnmowers and chainsaws can suffer from ethanol’s solvent properties, which may degrade rubber seals, gaskets, and fuel lines. Ethanol also absorbs moisture, increasing the risk of corrosion in older fuel systems not designed for it. For that reason, it is not recommended to leave fuel with Ethanol content sitting in fuel tanks or jerry cans for prolonged periods. This is why many manufacturers and regulators still caution against using E15 in vehicles built before the early 2000s.
To help consumers navigate the change, E15 pumps are clearly labeled at gas stations, often marked as “Unleaded 88” or explicitly stating the 15% ethanol content. Drivers of incompatible vehicles are advised to stick with E10 or ethanol-free options where available.
The New Normal?
Ultimately, the expanded use of E15 is supposed to be a short-term solution to a complex problem, though there is every chance it will become the new normal going forward. While it may shave a few cents off fuel prices and stretch domestic supply, its broader impact remains uncertain. Availability is still limited in many regions, and any long-term savings will depend heavily on global oil markets.
As tensions persist overseas, ethanol is once again playing a key role in America’s effort to keep drivers moving without breaking the bank.
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