- May 2, 2018
Can I burn 100 octane in my Champ all the time or should I run some premium car gas through it. I do have the auto gas stc.
Bob , are you saying you use 75% regular auto gas ( Not the high octane , ethanol free .) to 25% 100LL mixture in your small Continental ? I have a 90HP in my Champ and am wanting to learn what works best ! Thanks ,Randy.100 LL has four times the lead that 80/87 had. That is why a lot of us use a 75% mixture of auto regular. I have had the STC since the 1970s and have been burning auto since the 1960s.
Auto fuel does not seem to affect autos catastrophically. Our small Continentals are at least half as sophisticated as an auto engine from the 1950s. They are rather more like lawnmower engines.
Also, remember what kind of fuel was available when the first A-65 hit the market. They restricted the 65 to 73 octane minimum. And gas was dirty; hence the gascolator on a 1950 Ford convertible.