The latest fuel price war is expected to provide some relief to hard-pressed motorists who are struggling with costs including van insurance, tax and maintenance costs.
Asda has slashed the prices of petrol and diesel by 2p a litre, which means drivers filling up at the supermarket chain's forecourts will have to pay no more than 128.7p a litre for petrol and no more than 132.7p a litre for diesel.
Sainsbury's has responded by announcing a cut in its fuel prices by up to 2p a litre from midnight on Wednesday.
The chain also offered 10p off every litre of fuel to customers who spend £60 or more in store or online between Wednesday and Sunday.
Last week also, supermarkets made a 3p cut in fuel prices following a sudden drop in the cost of oil internationally.
"Once again Asda is leading the way in saving drivers' money and, in only 72 hours, we've taken up to 5p a litre off the cost of filling up," the chain's petrol director Andy Peake said.
© Press Association 2011