What is UL94 fuel?

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UL94 is a 94+ Motor-Octane aviation gasoline without Tetraethyllead that meets the ASTM D7547 Unleaded Avgas specification. UL94 is also rated as a super-premium ethanol-free auto-gasoline with a 99 octane (R+M)/2 rating that meets and exceeds the ASTM D4814 autofuel specification.

Does Mogas contain ethanol?

According to Aircraft Owners and Pilots Association (AOPA), it is estimated that 51% of the MOGAS contains ethanol [24,25] which hampers the engine functioning as “ethanol is incompatible with aircrafts’ fuel delivery system” [6,16,23,26, 27] .

Where is UL94 available?

Airports in San Mateo, Santa Clara, Los Angeles, and San Diego counties will receive this distribution, which builds on the six-year effort by Swift Fuels to provide UL94 unleaded avgas to piston aircraft pilots nationwide.

What’s the difference between Mogas and avgas?

In a nutshell, Mogas which is otherwise known as motor gasoline, is used by ground vehicles, while Avgas is specifically developed for aircraft use. Part of the process of supplying a dedicated aviation fuel involves strict specification and quality control measures.

Can I use ethanol with the STCs?

Ethanol cannot be legally or safely used with the STCs. Fuel containing MTBE or ETBE is acceptable and approved. Fuel blended to D-439 or D-4814 without alcohol is acceptable and legal for use with the STCs. If your state does not require compliance to these specs, it does not necessarily mean that your fuel does not comply.

Can I use Avgas with the auto fuel STC?

Installing the Auto Fuel STC does not restrict you to using only auto fuel. Avgas can still be used, and it can be mixed with auto fuel if you wish. Without the STC, you are limited to only avgas.

What kind of fuel can I use with the auto fuel STC?

High compression STCs require the use of 91 AKI (minimum) premium unleaded or leaded automotive fuel. Installing the Auto Fuel STC does not restrict you to using only auto fuel. Avgas can still be used, and it can be mixed with auto fuel if you wish. Without the STC, you are limited to only avgas.

What octane fuel is used in airliners?

including nearly all 80/87 octane engines and the majority of airplanes in which these engines were installed. Several high compression engines are also approved for the use of 91 octane auto fuel including the 180 horsepower 0-360 and the 0-235-L2C. Why install an Auto Fuel STC?