What is the best fuel for a Rotax 912?
Best fuel to use for your Airplane Light Sport Aircraft ROTAX engine is unleaded auto gas, premium (91 octane) for 100 HP 912S and 115 HP 914 turbo, but regular (87 octane) is OK for 81 HP 912. The 912 ULS/S is the high compression 1400cc, 100 HP engine. It’s probably the best selling engine, but it requires min 98 octane to achieve the power without risk of detonation (the only Rotax engine that do). The 914 is the turbocharged 1200 cc 912 UL/A/F engine. HP.