EPA finalizes record ethanol blending mandates through 2027

EPA on March 27 finalized 2026 and 2027 Renewable Fuel Standard volumes, the highest in the program's history, with 70% small-refinery-exemption reallocation.

The agency said the rule would restore a larger share of exemptions granted for 2023 through 2025 and cut U.S. dependence on foreign oil by roughly 300,000 barrels per day over 2026 and 2027. That puts fresh policy weight behind a fuel pool that is already saturated with low-level blends, but still bounded by vehicle approvals, retail equipment and limited higher-blend infrastructure.

The U.S. Department of Energy says E10, a blend of 10% ethanol and 90% gasoline, is the most common gasoline blend and is approved for use in any conventional gasoline-powered vehicle. The Alternative Fuels Data Center says more than 98% of gasoline sold in the United States contains some ethanol, and EPA says a 1978 Clean Air Act waiver first allowed 10 volume percent ethanol in gasoline. E10 was sold in all 50 states by 2010, which shows how fully ethanol has already been absorbed into the mainstream gasoline pool.

EPA approved E15 in 2011 for light-duty conventional vehicles model year 2001 and newer, but the retail network for much higher blends remains thin. The Alternative Fuels Data Center says about 3,500 U.S. fueling stations offer E85, mostly in the upper Midwest, and E85 itself can contain 51% to 83% ethanol depending on geography and season. That leaves the next step in ethanol growth tied less to supply than to the systems that move fuel from refinery and terminal to pump, and to the broader vehicle eligibility that would let higher blends reach beyond a narrow retail footprint.

The Renewable Fuel Standard, created in the Energy Policy Act of 2005 and expanded by the Energy Independence and Security Act of 2007, has become the main policy lever for that market. The Renewable Fuels Association said the 2026-27 rule brings certainty and stability to the ethanol market, while the American Petroleum Institute has backed year-round E15 access and reforms to the small refinery exemption process. API publicly urged Congress to pass year-round E15 legislation on January 22, 2026, and later applauded House passage of the Nationwide Consumer and Fuel Retailer Choice Act on May 13, 2026.

The fight over ethanol now sits at the blending ceiling: E10 is already embedded nationwide, E15 remains restricted to older light-duty vehicles, and E85 still has only a limited retail footprint. EPA’s record RFS targets extend the mandate through 2027, but the next chapter depends on whether vehicles, pumps and policy move far enough to turn those volumes into a broader transport fuel transition.