The unit formerly used in Britain, Canada, Australia, and other British Commonwealth nations to measure the fuel efficiency of motor vehicles, analogous to the U.S. unit but based on the Imperial gallon [3]. Although still used sometimes, this unit has been replaced officially by liters per 100 kilometers; "x" miles per Imperial gallon is equal to 282.481/x liters per 100 kilometers. One mile per Imperial gallon is equal to about 0.8327 mile per U.S. gallon