I have one with a P70 and one with a P80 both with only stock fuel tanks but I use a taxi tank for start up and taxi onto the strip. Flight times are 6.5-7 mins with the P70 and 5.5-6 mins with the P80 with plenty of fuel left for landing. Depends on your flying style though. I am not a "belt around the sky at full throttle the whole time" guy. I prefer to fly my jets scale-like and use the throttle.

With the c of g at 175 you only need 40-45mm of elevator travel as you are not having to fight a nose heavy aircraft.

Hope that helps.

Craig.