Both of these article are based on the standard SAE standard of brake specific fuel consumption(BSFC)between .40 Lbs and .50 Lbs per hour per HP on a motor on a stationary engine dyno at WOT, not in a car accelerating at WOT
Once you get a drag race motor to be real efficient the BSFC will drop down well below .04 LBS per hour per HP, so that being said a 800 HP motor should consume around 400 lbs per fuel per hour per the SAE formula being on the safe , rich, side and most race gasoline weighs around 6.25 lbs per gallon so that motor should consume right at 64 gallons per hour
Once you gain some real life experiences at the track you will find that the SAE theory doesn't work well enough to keep the motor in fuel at WOT under acceleration
The fuel system needs to have the ability to feed more fuel to the motor than it needs, if you accidently lean it out at WOT and the motor goes into detonation you can ruin that motor
Be safe when building and racing, always
BTW, I am using a Aeromotove 1000 pump to dyno tune the pump gas 572 C.I.EFI motor I'm building for a local customer, I'm shooting for 800+HP on Oregon pump swill
I'll post the results on here when I'm done, wish me luck