Gasoline Rules Limit Ethanol Use During Peak Demand

Summer fuel rules cap ethanol demand and limit corn upside.

Ethanol gasoline fuel nozzle and corn kernels. Biofuel, agriculture and fuel price concept

JJ Gouin - stock.adobe.com

LUBBOCK, TEXAS (RFD NEWS) — Gasoline formulation rules — not fuel demand — are limiting ethanol use during the highest-consumption months of the year, directly impacting corn-based ethanol markets.

Federal regulations tied to Reid Vapor Pressure, or RVP, require lower-volatility gasoline blends during the summer to reduce emissions. Because ethanol increases volatility when blended, most of the country restricts blends above 10 percent during peak driving season, effectively sidelining E15 just as gasoline demand rises.

That dynamic creates a seasonal ceiling on ethanol use, even as gasoline demand strengthens. The Environmental Protection Agency has occasionally issued waivers allowing summer E15 sales, but without a permanent policy fix, ethanol demand remains inconsistent.

For corn producers, the impact is direct. Ethanol accounts for a major share of domestic corn use, and limiting higher blends during summer reduces potential demand growth at a critical time.

Fuel markets also feel the effect. Ethanol is typically a lower-cost blending component, meaning restrictions can contribute to higher gasoline prices.

Farm-Level Takeaway: Summer fuel rules cap ethanol demand and limit corn upside.
Tony St. James, RFD News Markets Specialist
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Tony St. James joined the RFD-TV talent team in August 2024, bringing a wealth of experience and a fresh perspective to RFD-TV and Rural Radio Channel 147 Sirius XM. In addition to his role as Market Specialist (collaborating with Scott “The Cow Guy” Shellady to provide radio and TV audiences with the latest updates on ag commodity markets), he hosts “Rural America Live” and serves as talent for trade shows.

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