Forecourt prices should be slashed as petrol is being sold for 6p more a litre than it should be, said the RAC.
The motor group said an average price of 142p was far ahead of the 103p a litre wholesale value last week, with a coinciding drop in oil and strengthening of the pound meaning drivers should be paying less at the pump.
“The biggest retailers’ refusal not to reduce their prices to fairer levels is continuing to cost drivers dear,” RAC policy head Simon Williams said.
Accounting for a retailer margin, petrol should still be closer to 136p and diesel at 139p against its average current price of 147p, RAC added.
“While the Competition and Markets Authority has clearly stated drivers were overcharged last year, it’s blatantly apparent from our data that this problem is persisting,” Williams continued.
“If prices don’t fall dramatically in the next week or so, we believe the government and the CMA should get all the biggest retailers together to demand an explanation.
“Tough action needs to be taken to change this as drivers are losing out badly every time they fill up.”