Colorado’s Rocky Mountain Metro Airport Launches Unleaded Avgas

Why It Matters

The rollout reduces lead exposure for communities near airports and signals the aviation industry’s shift toward cleaner fuel, influencing future regulatory and market dynamics.

Key Takeaways

• RMMA now offers Swift Fuels UL94 unleaded avgas.
• State subsidy keeps unleaded price equal to 100LL.
• Up to $115 STC reimbursement for eligible aircraft owners.
• Only 20‑25% of piston fleet currently compatible.
• FAA draft aims for nationwide phaseout by 2030.

Pulse Analysis

Leaded aviation gasoline has long been a hidden source of toxic emissions, especially in regions with dense general‑aviation activity. Recent studies by Colorado’s Department of Public Health and the academic community have linked elevated blood‑lead levels in children living near airports to the use of 100LL fuel. Community pressure, amplified by lawsuits in Boulder County and Superior, has forced local authorities and airport operators to explore alternatives that protect public health while maintaining flight safety.

RMMA’s adoption of Swift Fuels UL94 marks a concrete step toward that goal. The state‑funded price subsidy eliminates any cost penalty for pilots, and the $115 STC rebate lowers the financial barrier for aircraft owners needing certification. However, only a quarter of the airport’s piston‑engine fleet can immediately benefit, and early reports of engine overheating in hot weather highlight technical challenges. Pilot hesitancy remains, underscoring the need for broader education and real‑world performance data to build confidence in unleaded formulations.

Nationally, the FAA’s draft transition plan envisions a phased elimination of leaded avgas by the end of 2030, but the roadmap still lacks clarity on fuel availability, infrastructure upgrades, and enforcement mechanisms. As more airports like RMMA and Centennial pilot unleaded options, supply chains will expand, potentially driving economies of scale that keep prices competitive. The industry’s gradual shift promises reduced environmental impact, fewer health‑related liabilities, and a more sustainable future for general aviation, positioning the United States to meet emerging global standards for clean aviation fuel.