Waterpilot asked
Does the APU really burn 75 gallons of jet fuel per hour (if my calculation of 2000 pounds equivalent is right)?
A typical widebodied airliner APU burns approximately 300 kgs of jet fuel per hour on the ground or 660 lbs. If needed during flight it is more efficient at cruise altitude and uses approx 100 kgs or 220 lbs per hour.