Liter [1]

The basic liquid measurement unit in the metric system. In most industrial nations outside the United States, motor fuel is now sold by the liter, not by the gallon.

A liter (also spelled litre) is 0.2642 of a U.S. gallon.

In the early 1980s, the Office of Weights and Measures of the U.S. Bureau of Standards coordinated an effort to convert petroleum marketing measurement, in the United States, from gallon [2] units to liter units. Hundreds of  American gasoline stations began selling gasoline [3] by the liter. The public, however, did not perceive advantages in the change, and the effort failed.