How will that work if you only have a tenner in your account and only want £10 Of petrol?
Other petrol stations I have been to take the money you spend straightaway, rather than £1 and x amount by later.
Always use Tesco pay at pump, much quicker and easier. Ok fact, Tesco only take a quid when you put your card in, the balance is not paid for 2-3 days.
With the US. I had a meal in SF and was in and out of an expensive restaurant in about 20 minutes. Food delivered as soon as I ordered it...