From the airshows I have been at, the fighter displays are done one of two ways, refueled off-site for the display, and fueled at takeoff, with RTB at completion. The pointy-noses (fighters) generally don't do to much min fuel planning, as the air show performances don't induce g-loads or maneuvers that isn't inherent to the airframe. As far as fuel burned, for a 10-12 minute AB
off demo, I believe it is in the area of 3-4K lbs. AB
on, I believe 7-9k. Either way, most pn's are in the range of 10-14k fuel to begin with, and quite a bit of an aerial demo is done at mil power (MRT) or better, so it drinks quite a bit of gas. Sorry its so vague, I'm only the gas station attendant.