I have been running 4 cycle engines since they first came out and still have all 5 versions of the original OSFS60 including the very first one with the machined heads and rockers. Been using them since 1977. I know what works and what doesn't and have tried about every combination you can think of. Tried all the "claimed" 4 cycle plugs as they came out. There are only two I use. the Enya #3 and the OS type F. You say the Enya is a two Cycle plug?? Then why is it that Every Enya 4 cycle comes with one and Enya recommends them? Enya makes a #3,4,5,and 6 and they get colder as the number increases. The #3 runs the best of all and the cold plugs will not idle. I run the three in just about every glow engine I have. By definition if the same engine is using more fuel it is generating more power.

Saito 45 with an enya #3, HShack white lightning fuel and Zinger 11x6 prop. Pilot Sky Loop 404 with a 6 ounce tank. Will run over 25 minutes. I wouldn't call that excessive fuel consumption.

At least close?? I'm right on.