catch some mileage

To say or do something in an attempt to gain an edge or favor with someone. Especially if you're in an awkward spot.

Guy 1.. Man you owe me 20 dollars.
Guy 2. Man I'm out of work. Besides, we're supposed to be friends.
Guy 1. Listen you owe me money. Don't be trying to catch some mileage on me with that friends shit.