I have had my avistar with a .40 LA and a 11*5 and I will fill the tank and look at my fuel tank and the level drop two inches and fly 4 flights of 10 to 15 minutes. but I do refuel after flight. and when I infill it will only be down about an inch. so that 40 is very efficient and i haven't tried but I say I could have a 30 minute flight and land fine