Rich, thanks for your help. Gas engines must not drink the fuel like a nitro engine. In my small planes if the manufacturer recommended a 6 oz tank I always put in a 8 oz. That extra 2 oz would give me my 15 minute flights.
This will be my first large plane and gas engine. I might be picking your brain for info. You've built more than one BUSA cub, did you ever modify your wing mounting like Tom Crump did or just go through the door? I like what Tom did and I might incorporate that in my plane.
Thanks for the information.