On average the US alone consumes 400,000,000 gallons of gasoline a day some years almost twice that. The gas is still fairly high here in SD at $3.10 a gallon. If you assume it averages out at maybe $3.50 a gallon across the country thats roughly $1,400,000,000 a day, or $51,100,000,000,000 a year. And thats just gasoline. Theres also aviation fuel (jp4), deisel, and propane. Someones makin a lot money somewhere.
I just checked on the currency exchange rate on the american dollar vs. the mexican peso and here it is: one mexican peso = .54339% of a dollar! Holy smoke their catching up to us.
http://www.x-rates.com/calculator.html