Originally Posted by
piperboy84
I have an Peterson/Maule auto gas STC for my Maule airframe and Lyc 360 engine. The issue I have is I can’t find auto gas to meet the anti knock MON/RON minimum rating specified in the STC and without ethanol so the auto gas STC is pretty worthless.
I had a long chat with Petersen quite a while ago on the issues. The only available fuel meeting all tested requirements at that time was BP Ultimate 102, on the continent also sold under Aral brand. But, that was before they changed recipe, so not sure this holds any longer and I haven't seen 102 on tap for a while at our local stations. As a result of the discussion I kept in mind that modern additives in common autofuel obscure the easy field alcohol test and render them useless. The STC may still hold even legally, as it primarily states 'commonly used autofuel' and many fly on 97 or even 95. With quite some flying material now burning Ethanol fuel the fear seem to fade a bit also. What does Gomolzick say to fuel quality, will 95E10 do and be tested?