Fuel Dig for Denver Airport is illogical. 40% more fuel for 500% more passengers seems like we should be wondering why KFIA uses so much not Denver.
Simple Sauce
https://en.wikipedia.org/wiki/King_Fahd_International_Airport
https://www.denverpost.com/2017/03/04/its-official-2016-was-the-busiest-year-ever-at-denver-international-airport/