flyinblind,the 4 stroke should get you better mileage than what I expect to see from my 2 stroke,so the smaller tank should do you good.One problem I had was when I was trying to glue the curved section behind the engine was that my helper and I got a little in front of each other and wrinkeled the material suppiled with the kit and I had to cut it out,go buy new 1/32th plywood and do it again.I made an additional former and spaced them out to get more support and glueing area.It is fine now.I build much slower than you and will post some pictures later.I can't wait to fly this plane but I don't build at such a pace that it seems like a job that I have to make myself do.It's a hobby,should be relaxing and that is how I am going to approach my 3rd time getting into rc.