Anyone can just calculate whatever they feel like with number taken from the the internet. Do you realize that according to you're calculations a flight to Europe in a 747 would cost approx 800$/person in fuel only? Does that not make you second guess your so called calculations?
A) The distance is actually 4050.3 statute miles
http://www.landings.com/_landings/pa..._dist_apt.html
B) 5 gallon a mile is probably (the site you quoted suck) a fully loaded 747 with full payload. This is surely not the way the president travels.
C) the price you posted is retail at the airport. i hope you don't believe that you fill up a airliner plane like you do your car. The actually cent/gallon paid at refineries last week is 174. i would think the Gov of the US to buy it maybe at around 2X that price on average. That with all the options, hedging it must do for it's fleet.
http://www.iata.org/whatwedo/economi...itor/index.htm
Conclusion... don't talk about shit you have ABSOLUTELY no idea about.