Iraq is a now broken third word country/economy in recovery so not a great comparable to US. Sweden is small but a good comparable culturally/development-wise. US is 331 million people. It spends 3% of GDP on military. 3% of 331m is 10 million. Sweden is 10 million people. U.S. military fuel use is in line with Sweden’s.
I could be off here (DOD!=US military?), corrections welcome, but I wouldn’t even be shocked if a military entity uses 3-10x more fuel than a civilian average and above math puts us surprisingly close to 1x.