Cash-strapped motorists have changed the way they drive forever The AA's Monthly Fuel report last night claimed the average price for unleaded had crept back up to 131.17ppl, from 130.44ppl at the start of the month. Diesel has climbed by almost a penny to average 138.61ppl. The organisation added that motorists in smaller rural and coastal towns were continuing to lose out in the petrol "post code lottery," and were paying 4p to 5p per litre more than drivers in cities with far more supermarket competition. Mr King said: "In late November supermarket petrol in Market Drayton was 6p a litre more expensive than down the road in Stoke-on-Trent. We can forgive struggling remote petrol stations for doing that, but not one of the Big Four supermarkets. Drivers will, have and should vote with their wheels and fill up elsewhere. The AA said that on average, unleaded petrol is currently cheapest in Yorkshire/Humberside and the north of England, at 130.7ppl with the most expensive in Scotland, 131.6ppl. Asda, which cut prices on Wednesday, is the cheapest for unleaded, followed by Sainsbury's and Morrisons. BP is on average 4ppl more expensive than Asda.