Petrol stations and retailers have “pocketed” the benefit of a 5p fuel duty price cut, the chair of the Treasury Select Committee has claimed.
Conservative MP Harriett Baldwin accused retailers of not passing on the tax reduction to drivers.
Fuel duty was cut last March, but there were concerns it was not immediately reflected through lower pump prices.
An investigation found the cut had been passed on, but said increased profit margins cancelled out the benefit.
On Monday, the Competition and Markets Authority said supermarkets, known usually to have cheaper fuel prices, had sought to increase profits from selling fuel, increasing their margins by 6p per litre on average between 2019 and 2022.