Drivers have been warned not to rely on their supermarket for petrol as they could see themselves overpaying when they fill up their tank.
The RAC has said that major retailers are failing to reduce petrol prices for motorists, despite wholesale costs falling. The roadside recovery firm said that drivers are paying 183p per litre on average - but the wholesale cost is back down to 131.75p per litre.
After seeing fuel costs hit their highest ever levels earlier in the summer, the wholesale price of petrol has since fallen by 20p since early June, according to the RAC. The wholesale cost is now back down to levels last seen in early May, when the average price of a litre at the pump for drivers was around 167p, WalesOnline reports.