KentuckyColonel

I am in the process of assembling a Richmodel 120 P-51. I'd like to go gas with this one. Even if gasoline gets to 5 bucks a gallon, that's a lot cheaper than 22 bucks a gallon for nitro. I have never dealt with gas before, and would like a little input on engines. I'm thinking a 20cc would do the trick? I'm an old retired guy on a fixed income, so economy is what I need.