Petrol prices could dip by another 3p over the next two to three weeks, the AA has predicted.
Supermarket cuts have helped push the average price of petrol to 136.89p a litre.
This is 3.02p lower than a month ago, with average diesel prices having fallen 4.62p to a current 141.76p a litre.
With wholesale fuel prices falling, the AA says average petrol prices could fall to about 134p a litre soon.
At present, the cheapest petrol in the UK is in London at 136.1p a litre on average, while Humberside has the cheapest diesel (140.8p).
AA president Edmund King said: “Last April, UK petrol consumption fell. In October, it did the same.
“And in February, the UK sold the lowest volume of petrol in 23 years of recording.
“In the past 12 months, oil and fuel price speculation has swung back and forth through the fuel market like a wrecking ball, smashing family budgets, rocking the foundations of fuel retailer and business viability.”
He continued: “The last 12 months have shown pump price volatility is more acute than ever, driven largely by speculation.
“At least, though, the current prices are going in the right direction – giving drivers a breath of optimistic spring air.”