Some of those small gas engines are still nearly as sloppy as glow!! The Dynamite .31 is supposed to run 50:1 I believe, but the Norvel GX40 still uses 14% oil as a comparison. The only way you'll get an engine to be less sloppy than a glow engine is to get those fandangled needle bearings on the conrod. Even then, I think 50:1 is too lean a mix even for needle bearing engines. I like 16:1-24:1 even in big high revving engines. Then again, I don't mind the slimy mess a glow leaves behind. Some of you would probably cringe at how much oil my R120 Enya spits out on fuel with 20% castor oil lube.