Mileage

n.
  1. An allowance for traveling expenses at a certain rate per mile.
  2. Aggregate length or distance in miles; esp., the sum of lengths of tracks or wires of a railroad company, telegraph company, etc.
  3. The number of miles that a vehicle can travel after consuming a certain quantity of fuel; in the United States, usually expressed in units of miles per gallon; as, smaller cars tend to get better mileage. It is sometimes used as a nmeasure of the energy efficiency of a vehicle.
  4. Use, profit or advantage; as, he got a lot of mileage out of one hit record.
    5. Constructive mileage ,
    a mileage allowed for journeys supposed to be made, but not actually made.