By Paul Bertorelli

Compared to piston aviation fuels research, mushroom farming is a daylight operation. That’s not to say the fuel work is secretive, it’s just that it goes on more or less constantly, but nothing meaningful seems to come of it. At least you can have the mushrooms on your salad.

Against this backdrop of apparent non-action comes yet another entrant into the 100LL replacement sweepstakes, this one called G100UL. This new fuel comes at the problem from far out in left field from a company known more for burning fuel than creating it: General Aviation Modifications, Inc., the Ada, Oklahoma, mod house that shook up the hidebound world of aircraft engine research…