This is what is referred to as the value per dollar received for anything at a strip club. For example, a dancer who does something extra or special on stage for you is considered to be giving you extra mileage. High mileage laps are equated to lap dances which give the customer something extra, usually in the form of polishing the zipper, high degree of contact, or much more. Basically a high mileage dance is very enjoyable. Conversely, low mileage laps equate to low or no contact lap dances which are cold, impersonal, and generally do not excite; see air dance.