Meaning of “mileage” - Learner’s Dictionary

mileage

noun uk us /ˈmaɪlɪdʒ/
DISTANCE [ C, U ]

the number of miles that a vehicle has travelled since it was new:

low mileage
FUEL [ C, U ]

the number of miles a vehicle can travel using a particular amount of fuel

ADVANTAGE [ U ] informal

an advantage got from something:

There's no mileage in taking your employer to court.

(Definition of “mileage” from the Cambridge Learner’s Dictionary © Cambridge University Press)