[[File:Gas-price.jpg|thumb|380px|trends in pump price in USA, in 2009 dollars]]
Gasoline is refined from [[crude oil]] via [[distillation]]. Gasoline is sold at gas or fueling stations where it is pumped into [[vehicle]]s. Gasoline is usually sold in three grades: regular (87 octane in most places, and the cheapest), a mid-level grade (89 octane) and premium (93 octane, usually the most expensive). Most gasoline sold in the U.S, contains 10% ethanol. Some stations also sell a gasoline mix which is 85% gasoline and 15% ethanol which has an 88 octane level; this can only be used in cars built in 2001 or later, or that are specifically designed with "flex-fuel" engines; it cannot be used in other gasoline-powered engines such as lawn mowers.
According to national figures from the U.S. Department of Energy, in May 2007, 46% of the cost of gasoline went to pay for crude oil, 28% for refining, 13% to taxes, and 13% for distribution and marketing.<ref>[http://tonto.eia.doe.gov/oog/info/gdu/gasdiesel.asp Energy Information Administration]</ref> While prices have risen to new highs, in [[inflation]]ary terms, gas prices are still lower than during the 1973 Energy Crisis or the 1979 Energy Crisis. Prices have gone down since the Trump Presidency.