Apart from paying for a roof over my head, my biggest monthly outgoing is on petrol for commuting. I spend about £400 a month. I currently pay by debit card and I try to always fill up at the cheapest forecourt in town. My question is, given that I spend so much on petrol (nearly £5,000 a year) does anyone know of a credit card cash back or rewards scheme that I could be benefitting from? I don’t make any other significant purchases though.