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→Fuel: update prices
Gasoline ("gas") is sold by the gallon, at stations that are primarily self-service (you must pump your own gas) with the exception of those in New Jersey and Oregon (where self-service is illegal). The American gallon is smaller than the UK gallon, and equals 3.785 liters. The U.S. octane scale is different from that used in Europe; a regular gallon of U.S. gasoline is rated at 87 octane, the equivalent of about 92 in Europe. In most states, gas stations offer a choice of three levels of octane: 87 (regular), 89 (midgrade or plus), and 91 (premium). Unless you are renting a luxury vehicle, your vehicle will likely require only 87 regular.
Visitors from countries where self-service is illegal may feel intimidated by the idea of pumping their own gas, but should not be. U.S. self-service gas pumps have clear directions printed on them and are easy to use. The pump will automatically stop when it senses gas backing up into the nozzle (thus indicating the tank is full). When you finish, replace the nozzle in its slot on the pump, reinsert and turn the gas cap until it begins to make clicking noises, and then close the gas cap access door.
Diesel is not as common, but still widely used and available at most stations, especially those catering to truckers. Untaxed "offroad diesel", sold in rural areas for agricultural use, is dyed red and should not be used in cars, as there are heavy fines if you're caught.
Despite increasing petroleum prices worldwide and some increases in gas taxes, the American consumer-voter's attachment to his automobile, combined with abundant domestic oil reserves and relatively low taxes on gasoline, has kept retail fuel prices much lower than in many parts of the world. Prices fluctuate by region and season. As of
Gas prices vary dramatically from state to state based on a number of variables, primarily state sales tax rates (which are invariably included in the advertised price) and anti-pollution requirements. The highest prices are usually found in Hawaii, Alaska, the West Coast, Illinois, and New York. The lowest prices are generally found in the south central U.S.