> The average price of a litre of petrol fell from an all-time high of 121.6p in mid-May to 118.08p now, the report said.
But large areas of south-east England and the rural Midlands have supermarket petrol currently priced at 119.9p.
In some other areas, supermarket petrol is as cheap as 114.32p a litre, while in some areas there can be large disparity in prices in neighbouring towns, the AA said.
Overall, the average price of diesel fell from a high last month of 123.08p a litre to 120.52p, with the cheapest supermarket diesel found at Asda (117.32p).
Taking all fuel-selling outlets into account, the watches-k cheapest petrol at the moment can be found in Yorkshire and Humberside (116.8p a litre), with the dearest in London (119.3p).
Yorkshire and Humberside also has the cheapest diesel (119.5p a litre), with Northern Ireland having the most expensive (121.3p).
AA president Edmund King said: "Wholesale petrol prices tumbled from around 40p a litre in early May to around 36p by May 24.
"Although Asda and Morrison largely passed on http://www.wubags.com/handbags-h/ the entire saving, other supermarkets have been much more selective as to which customers are enjoying the full respite from record high prices."
He went on: "Unfortunately, with oil prices back above 75 dollars a barrel, we are expecting wholesale prices to rise again - which only makes the failure to pass on cost cuts all the more galling.
"Drivers are right to ask how a small rural petrol station between the Surrey town of Farnham and the M3 can sell petrol at 115.9p a litre, and stay in business, while a major supermarket in the town centre, with all its buying power, charged 119.9p."
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