well i use 12oz tanks on my fun fly lasts about 20-25 minutes of flying i have a sig ultimate with a k&b61 u can see the pic at the fun fly pictures post well the plane is a great flier and torque roller but its not good for harrier/elevator too unstable for that and this plane tipstalls a little bit oh yea and this plane is really hard to deadstick i still preffer to fly my lanier pro twister because im more in to harriering stuff and the sig ultimate isnt a very good performer at that but this plane is good for really wild snaps and spins u will prolly enjoy it a lot.