My F-18 has a Titan and has 110 oz on board. After about 5.5 min at full throttle, the main tank is still 1/2 full. I don't know the capacity of each tank, but the main tank is very large..........maybe 8" long 6" at it's widest point and about 7" tall. If I am conservative with the throrrle, I won't even touch the main tank.

Dom