Classification of the various energy sources for a car: gasoline, diesel and electricity. Most people today stock up on different grades of gasoline because that's what the average car does. takes. They generally don't consider an alternative to the gasoline they load into their cars. Although gasoline is widely used, it is not a car's only source of energy; Diesel and electric are alternatives to the general gasoline used by most cars. Although different from each other, diesel and electric are alternatives to the average gasoline received at a gas station. Diesel is a more concentrated type of fuel that is typically used by large automobiles because they require a lot of power in a short time. Electricity is a method that uses the power of batteries to produce a low-powered but still fast automobile. Electric cars are generally designed to be quiet and environmentally friendly. The purpose of this article is to classify and educate the reader on the different types of fuel available for an automobile: gasoline, diesel, and electric. General gasoline, used by most people, is generally the only type of fuel accepted on the average car in the United States today. General gasoline, more commonly known as gasoline, is the most readily available source of energy for a car today. This is because gasoline is generally cheap and readily available. Gasoline is defined by Poltcor as a "liquid petroleum-derived mixture composed primarily of aliphatic hydrocarbons and enriched with aromatic hydrocarbons, toluene, benzene or isooctane to increase the octane number, primarily used as a fuel in internal combustion engines” (Poltcor 3). Today, most automobiles rely on this type of gasoline. At gas stations, the general grades available are 87, 89, and 93. Each of the numbers represents the grade of gasoline, with 87 being the lowest, usually called Regular, and 93 being the highest, usually called Supreme. Generally, gas prices in the United States are cheaper than abroad. However, the price of gas has increased in recent years due to some problems with the Middle East. Even with this problem in the Middle East steadily increasing the price of gas, the United States maintains its ranking as one of the cheapest places to get gas, or gasoline. Although gasoline is cheap, it is required of every person to have an automobile and since automobiles depend on gasoline, gasoline distributors have the advantage that the public is willing to pay high prices for gasoline, if it is the cheapest on the market..