Drive offs from petrol stations is a regular call for the police, who have to give the driver the opportunity to return and pay. Being allowed to fill up before payment opens the door to mistakes (forgot wallet, I've done that), to insufficient funds and card rejected. It makes proving theft surprisingly hard.
I would think this would be seen as a poor use of police resources. If the cops refused to respond to such calls, the oil industry (it's not like they don't have any money) would have to upgrade their equipment. Pay-at-the-pump with a credit card or pay-before-you-pump with cash has been the norm in the U.S. for decades.