Three supermarkets are slashing pump prices from up to 5p per litre (ppl) today (Tuesday, September 30), following a downward trend in the cost of fuel in recent months.
Sainsbury's and Tesco both announced a drop of up to 5ppl, while Asda said it would reduce petrol by up to one pence and diesel by two.
The price cut follows a series of price falls that has meant fleets have already been enjoying some of the cheapest prices for over three years.
A supermarket price war in August pushed the average price for a litre of diesel down to £1.33, the lowest since February, 2011, according to the AA.
That fall in pump prices came after a steady decline in oil prices since the middle of June, when fears over the violence in Iraq pushed the price of Brent crude to a nine-month high at $113 a barrel.
However, concerns subsided and a higher Libyan oil output has brought costs down.
The AA welcomed the move, as did its rival, the RAC.