Embry-Riddle Aeronautical University has been testing General Aviation Modifications Inc.’s G100UL fuel in a school-operated Cessna 172 at the school's Daytona Beach campus. Researchers say the fuel is a promising alternative to 100LL. "Our students are green-aware, and they've made it clear we want to go in the direction of eliminating leaded fuel," said a school official. The two challenges to replacing 100LL with G100UL are cost and certification.

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