The term used to describe how much value (i.e. bang for your buck) you will get out of a [VIP Dance] (i.e. private dance) from a stripper in a [nudie bar].
A typical low mileage dance is completely hands-off. (i.e. no touching.)
A dance with fair mileage may include groping of the dancers ass and breasts.
A dance where youre getting great mileage will include titty sucking, kissing, petting and digital vaginal penetration.
In some very rare cases, a dance including a hand-job, fellatio or full-on sex would be considered exceptional mileage. This, of course, could also be considered prostitution.
* These videos are coming directly from Youtube, they may or may not be most relevant to the word "Mileage"