Was driving along Judgeford about to head over Transmission Gully last night when my petrol light came on - rookie mistake, I didn't take notice of it before setting off. Didn't want to risk trying to get to my destination so raced into Challenge Pauatahanui to put $40 in. Pump is on prepay so went inside to pay first, then assuming the pump would stop when it got to $40 I wasn't looking until I saw it tick over $50. Went inside to pay the extra and the guy said "don't worry about it." It was his mistake he sent the request to the wrong pump, otherwise it would have stopped.