Surely you don't park at a petrol pump to carry out your non petrol purchases? I can't think of a petrol station that doesn't have some form of parking away from the pumps?
None of the ones near me do, other than parking at the air and vacuum bits, but then that's just blocking those facilities. A popular place to park is at the delivery area. It's also a popular place to light up a cigarette and chat on a mobile phone, neither of which I would recommend...
