Gus was in the 850ish range on fuel. There were some suspicions on his dyno though. Running a monster and twins.
Adam Winslett was around the same from what I remember. He sprayed to 1000.
I know one member on here is around 800 from his ET.
When I talked to monster pump mike, he told me the pump had the fuel to do 1000hp. Winslet proved that, its just a matter of feeding the proper amount of air to it. From some sources, some very big VP's are coming.
Purely from my speculation, the issue is getting big enough turbo's lit in the narrow RPM band of the VP's.