Amid rising gasoline prices driven by global oil supply disruptions, U.S. regulators and lawmakers are promoting higher ethanol blends in fuel to help drivers save money at the pump. The Environmental Protection Agency (EPA) recently granted a waiver allowing the sale of E15 gasoline, which contains 15 percent ethanol, during the summer months—a period when it was previously banned due to air quality concerns. This waiver, initially set for 20 days starting May 1, is expected to be extended through the summer to increase fuel availability and consumer choice.
Ethanol, primarily made from corn, is blended with gasoline to reduce reliance on petroleum and lower certain tailpipe emissions. Traditionally, most gasoline sold in the U.S. contains 10 percent ethanol (E10). The move to allow E15 during summer marks a significant shift, as ethanol helps reduce carbon monoxide and nitrogen oxide emissions compared to pure gasoline. However, experts caution that ethanol production’s overall environmental benefits are mixed due to land use changes associated with increased corn farming.
While E15 is approved for use in most light-duty vehicles made since 2001 and flexible fuel vehicles, its summer use has been limited because burning ethanol releases volatile organic compounds that contribute to ground-level ozone formation—a harmful pollutant linked to respiratory issues. This effect is more pronounced in regions with low natural organic gases, such as Los Angeles, where smog is a persistent problem. Despite these concerns, the EPA’s temporary waivers aim to provide relief from high fuel prices exacerbated by conflicts affecting global oil markets.
In California, lawmakers are also seeking to expand access to even higher ethanol blends through E85 conversion kits. Assembly Bill 2046 proposes easing restrictions on devices that allow conventional gasoline vehicles to run on E85 fuel, which contains up to 85 percent ethanol. This bill passed the California Assembly unanimously and awaits Senate approval and gubernatorial consent. Supporters argue that E85 offers a more affordable alternative as it often costs significantly less than regular gasoline, insulating consumers from oil price shocks.
However, E85 delivers lower fuel efficiency—about 20 to 30 percent fewer miles per gallon—meaning drivers must weigh cost savings against increased refueling frequency. Currently, only about 1.3 million vehicles in California can use E85, and fueling infrastructure remains limited with roughly 640 stations offering it statewide.
Environmental experts remain divided on ethanol’s overall benefits. Some studies highlight reductions in greenhouse gas emissions due to ethanol use, while others emphasize negative impacts from land conversion for corn production and increased air pollution risks. Critics also warn that loosening regulatory standards on conversion kits could compromise emissions controls.
Despite these challenges, the push for higher ethanol blends reflects ongoing efforts by policymakers and agricultural interests to balance economic relief for consumers with environmental considerations. As debates continue over the best path forward, many experts suggest that transitioning toward electric vehicles may ultimately offer a cleaner solution for reducing transportation emissions.
