I think Barry has some good points about the fuel usage with the 100. You may find that the 100 doesn't use too much since it has more power and your throttle settings will be lower. I'm planning to change my tank. ( I just broke my fuse and need to transfer everything to the new one) Here's a Sullivan tank that I have found to fit in the fuse. I'm still working with it though and don't have it installed yet. I'll let you know. [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFU64&P=7]Sullivan tank[/link] The second one is supposed to fit too but I haven't tried it. [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFU45&P=7]tank 2[/link]