A fuel price war between supermarkets could force all pump prices to come down.
Yesterday, Asda announced it would cut the cost of fuel by 3p; Morrisons responded with a 4p cut.
Sainsbury's said it would follow Tesco's lead and offer customers who spend £50 or more in store 5p a litre off their fuel bill.
The move is a reaction to recent drops in oil price, and it's hoped that other fuel retailers will follow suit.
The price of a barrel of oil has fallen from a recent peak of $147 (£74) to $130 (£65).
Our reviews are based on hard data and thorough testing in the real world.
Up to the minute news from around the globe