The biggest fuel tank you can fit in the plane. I had a friend who used to fly one in a Giant Stinger about 10-12 years ago, and it was very impressive for power. The only bad thing was that it landed dead stick every time (out of fuel).
24oz tank should be okay. It'll pull you clean over to Fryburg. Sort of a collectors item now. I took an old broom stick handle and cut a 12 inch piece and theninstalled some heatshrink on one side. Makes a great giant "chicken stick" for the big glows.