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Gas is manufactured from crude oil in an oil refinery. The process of refining uses heat, pressure and chemical reactions to convert the crude oil into gasoline. A similar process is used to convert crude oil into diesel, jet fuel, motor oil, grease and chemical feedstocks.
Crude oil to gas conversion begins with running the crude oil through a distillation tower. During this process the crude oil is heated by using super-heated steam and the intense heat starts to vaporize the contents of the oil. Different components of the oil vaporize at different time depending on their boiling point. The heavier components rise a short distance in the distillation tower while the lighter ones rise to the top. These components or fractions are then condensed to liquid form and collected in trays that are arranged at varying heights inside the distillation tower.
Gasoline is light so when crude oil is heated, it rises to the top and then it is collected. Gasoline is a mix of alkanes and cycloalkanes and has a boiling range of 104 to 401 degrees Fahrenheit or 40 to 205 degrees centigrade. The collected gas is then further treated to remove all the impurities and it is stored on-site in the refinery until it can be delivered to various markets like gas stations and airports.
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Crude oil usage in USA is rather limited. In fact, burning crude oil in itself has limited use all over the world. In the US and the rest of the world, to extract maximum value from the crude oil it first needs to be refined into various petroleum products. The most popular of petroleum product in the US is gasoline. 
