Etymology
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mileage (n.)

formerly also milage, 1754, "allowance or compensation for travel or conveyance reckoned by the mile," originally in reference to American political representatives, from mile + -age. From 1837 as "fixed rate per mile," originally for use of railroad cars. Meaning "a total number of miles" (of a way made, used, or traversed) is from 1861; the figurative use in this sense, "usefulness, derived benefit" is by 1860. Of a motor vehicle, "miles driven per gallon of gasoline," by 1912.

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Definitions of mileage

mileage (n.)
distance measured in miles;
Synonyms: milage
mileage (n.)
the ratio of the number of miles traveled to the number of gallons of gasoline burned;
Synonyms: fuel consumption rate / gasoline mileage / gas mileage
mileage (n.)
a travel allowance at a given rate per mile traveled;
From wordnet.princeton.edu