gallons vs. hours .
i run my engines by how many hours i can get out of it.

why?
i have an associated MGT w.21( AE engine that came with it ) that i modded and has more than enough power to pull wheelies and yet i get almost 25min of run time.
i doubt it will ever see 10 or even 8 gallons.
i have a ofna ultra mbx w/axial .28 2s and it gets about 15 min of run time and it WILL see at least 8 gallons no doubt.
because of the varying engines and the different run times out there, it would just be foolish to rate an engines life by the gallons of fuel it uses.
not tryin to flame anyone but it just seems to me that it's common sense.
if one engine gets 10min of run time,and one engine gets 20 min of runtime.
by the time the 10min engine hits 10 gallons, the 20 min engine is only at 5 gallons.
it really is simple math