i work for dominoes using my GT and mines pretty standard and petrol/tips easily covers buying petrol.
I get £1 per delivery and if i put £10 in, on a good night i can come out with £25 - £40 in just petrol and tips so never have to touch my wages for petrol and just save up and buy new parts with my wages.
i usually get about 70 - 120 kilometeres to £10 thats town driving, driving slow and boosting sometimes