The brief dip in the price of petrol at the pumps appears to be over, according to latest figures from the AA.
Mid-June prices of petrol and diesel are a little lower than they were in mid-May but have edged up in the last few days, said the AA.
The average cost of petrol is now 136.07p a litre - down 0.86p on the mid-May average but higher than the 135.75p-a-litre figure on June 5.
Diesel now averages 139.77p a litre - down 1.72p on the mid-May figure but fractionally above the low-point of 139.34p on June 5.
The AA said it believes that despite the fall in prices since early May, petrol drivers have been denied much of the saving that the crash in oil price, from 126 US dollars a barrel to below 110 US dollars, could have allowed. This has short-changed drivers by around 2p a litre, or £1 a tank.
AA president Edmund King said: "Had the full potential 4p drop in petrol price, from May's all-time high of 137.43p a litre to the 133.5p seen in March when oil initially settled at 115 dollars, been passed on, it would have saved a two-car family £8.49 over the month and possibly improved Tuesday's inflation figures.
"Without transparency in the oil and fuel markets and a regulator to ensure fair prices, drivers, consumers and the nation are open to being ripped off by whoever wants to make an extra buck."
Currently, the most-expensive petrol is to be found in Northern Ireland, where the average is 137.4p a litre, while Scotland has the dearest diesel (140.5p).
Yorkshire and Humberside currently has the cheapest petrol at 135.4p a litre, and also the least expensive diesel (138.9p).