Green’s Dictionary of Slang

1. experience of life.

1962		C. Clausen I Love You Honey, But the Season’s Over 174: Why she’s got so much mileage on her you couldn’t trade her in if you wanted to.
1977		C. McFadden Serial 35: Carol’s van had a lot of mileage on it and so, he suspected, did Carol.
1985		J. Sherwood Botanist at Bay 157: If Bertie did kill her there’s no political mileage in it.
1999		Guardian G2 26 Aug. 7: Women can’t credit the fact that men often like someone with a bit of mileage on her.
2006		G. Pelecanos Night Gardener 21: She had some mileage on the odometer, but she was attractive.
2010		(con. 1973) C. Stella Johnny Porno 101: She wasn’t so bad looking. Had a little mileage on her, but she was a lot better than the skank did the magic act.

2. information.

1971		T. Lewis Plender [ebook] ‘They might have decided to see how much mileage they could get out of me’.
1981		R.O. Butler Alleys of Eden (1991) 168: He had already gotten all the real mileage out of Lahn that he was going to get.
2021		C. Hammer Opal Country 128: [W]ondering if there is any more mileage to be had talking to three pirates in a tub.