The Fuel STAR Act of 2026 modifies the federal Renewable Fuel Standard, which requires fuel blends to contain increasing amounts of biofuels, primarily ethanol. The bill caps renewable fuel mandates at levels matching projected ethanol consumption, allowing small refineries to more easily obtain exemptions from blending requirements based on economic hardship criteria, and extends the usability of certain renewable fuel credits from earlier years. The legislation also allows year-round sales of E15 gasoline, which contains 15 percent ethanol instead of the current 10 percent limit, by removing seasonal vapor pressure restrictions on these higher-ethanol blends. The changes primarily affect refineries and fuel producers, with benefits aimed at smaller facilities facing compliance costs, while also expanding consumer access to higher-ethanol fuel options.
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