Fuel Weight
&^%**^% thats a hell of a big tank in that roo !! how long are your flights ?? when i was flying my roo on a 1.08 and a pusher prop, i had 2 40oz tanks of glo fuel. I was landing after 20 min, and still had another 5 - 10 minutes worth left in there ... i use a 1.7 liter tank for jet a now and get about 6 min out of that ....
Wojtek