Eric F.
Agree with UL 94 FWIW. I’ve been using UL94 for years. I have to travel 40 miles to get it. Great stuff in my 160hp Lylclone.
OTOH, I can burn 100 LL and do as it’s the only avgas available on my field. The cheap FBO won’t install a second tank and pump for UL 94. Not that it would do any good. There’s a shortage of UL 94 due, I suspect, due to tank cars and trucks hauling it to KRHV.
Nothing but fouled plugs in my 150hp Lycoming when using 100LL. I had to switch to mogas for that engine. Had to haul it in 5 Gal containers. Cross country trips were almost impossible.
My C-85 doesn’t care what I burn. 6.3:1 compression ratio will do that for you. Lead does build up on the valve stems though.