ORIGINAL: Didier
I use about 3,5 liters of fuel with both the P-160SX and AMT NL Olympus HP.
This give me 7 minutes of flight time and 9 minutes runtime.
Are you filling the tanks all the way? I ask because the 2 stock tanks hold 5.8 liters
My classic Lightning had an original Jetcat Titan and averaged 12+ minute flights. A guy I fly with has a classic with a P160sx. He likes speed and goes full throttle most of the time and averages 9 minute flights. My new Ultra Lightning will have a P180 and should be able to get10 minutes of flight time on the stock tanks. I've personally seen P180 Ultra Bandits easily get 10+ minutes.
Interesting note on BVM's site about Ultra Bandit tank size and flight time- 17 minutes with 6.2L vs. 9 minutes with 4.8L. Scroll to the bottom, the Fuel Cell Discussion is above the flap servo arm addendum...
http://bvmjets.com/Pages/Addendums/UB%20Addendums.htm