Samolot,
I had a chance to look at the Zenoah G20 gasser at the Toledo show this year. It is advertised as being for scale planes, and after seeing it I do understand. It's a little bit bigger than a normal 60 sized glow engine, so it's not going fit in a lot of 60 sized planes. After seeing it I understand why they are saying scale planes, because it's going to need a big round cowl to fit under.

With that in mind, if you have a plane that it can fit on going to a gasser is a good alternative to the cost of glow fuel. Myself I'm in the process of moving to some gasser planes to save on the cost of glow fuel. I know that I don't spend as much as some do, but I still managed to spend $750 last year in glow fuel. Even with gasoline close to $3/gallon it's still cheaper than $16/gallon for glow fuel!!

Ken