Saudi Arabia is using 50% more per capita than the US. A little ahead of the US is cold Canada.
Then if you skip all rich, developed economies, there is a lot of nothing and then, at 25% of the US consumption is China.
In total values per economy you have to sum up China, India, Brazil, Russia and Mexico to get the value of total fuel comsumtion of the US. That means the 300 something million Americans consume as much oil as close to 3000 million people in mentioned economies.
Looked that up in Wikipedia and crosschecked with the CIA worldfactbook. It is interesting though to go through the answers and see how overestimated China is.