Gasoline, one of the main products refined from crude oil, accounts for just about 17 percent of the energy consumed in the United States. The primary use for gasoline is in automobiles and light trucks.  Gasoline also fuels boats, recreational vehicles, and various farm and other equipment. While gasoline is produced year-round, extra volumes are made in time for the summer driving season.  Gasoline is delivered from oil refineries mainly through pipelines to a massive distribution chain serving 167,000 retail gasoline stations throughout the United States. ¹ There are three main grades of  gasoline: regular, mid-grade, and premium.  Each grade has a different octane level.  Price levels vary by grade, but the price differential between grades is generally constant.