Is it because of the race fuel that you need 720 liters/hr? Because with regular fuel it should be much less. If you extrapolate what fuel a 350 BHP YB on dark greens uses (4x 381 cc/min@ 3 bar) you get about 1.52 liter/minute. So I would expect that for reaching 1000 bhp on regular fuel would require about 3x 1.52 x 60 = 273 liter/hr. So do you need more than 2.5 times more fuel because you are using race fuel?