I'm running four Evolutions with muffler pressure, 2-10cc, 1-15cc & 1-20cc and they are all running fine. I'm also running three Saito glow engines converted to gas, a 90TS, a 1.25a, and a 182T all using muffler pressure with the stock carbs.

Muffler pressure does work with gas just as it has with glow for forty years.