Natural gas is methane, CH4. Sometimes traces amounts of other things are added, for instance odorizers so that it is possible to smell the gas in case of a leak in the household.
Gasoline was not invented, it is a natural by-product of the petroleum industry.
The U.S uses about 20,680,000 barrels per day. The current cost for a barrel of oil is $73.61 (June 3rd 2010). Therefore the U.S spends about $1,522,254,800 a day. Basically you could say just over 1.5 Billion U.S dollars daily. On a yearly basis $1,522,254,800 * 365 = $555,623,002,000 over half a trillion!
Madness! Anyone for Renewables?