A 747 aircraft holds approximately 63,000 gallons of Jet Fuel in it's fuel storage.
The 747 aircraft needs all that fuel because the 747 aircraft burns 1 gallon of that Jet fuel every second it's flying in the air.
The 747 aircraft will burn 5 gallons of fuel for every minute that the plane is flying in the air which is a lot more fuel burned per minute or hour than a car or truck or even a bus or semi gets.
So if you think your fuel mileage is bad try operating a 747 and keeping it fueled up.
The 747 aircraft has a range of 7,790 nautical miles on that fuel tank when it's full.