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The AA says petrol prices have recorded their biggest fall since 2008, taking the average cost to 132.16p a litre.
The motorists' lobby group said average petrol prices fell 5.49p a litre between mid-September and mid-October, the biggest monthly fall since prices fell 11.5p in November 2008.
The price of diesel has fallen from 142.50p a litre to 139.12p.
The AA said lower wholesale fuel prices had prompted the price drop, but warned that further falls were unlikely.
The organisation says the recent drop in prices means the cost of filling up the tank of a small petrol car has fallen by £2.74, while a larger vehicle, such as a Ford Mondeo, would cost £3.84 less to refuel.
Northern Ireland is the most expensive place for petrol, with an average pump price of £132.9p a litre, and London, the north of England, and Yorkshire and Humberside are the joint cheapest at 131.9p.
Scotland is still the most expensive for diesel at 140.1p a litre, while London is the cheapest at 138.6p.
Regional variations depend on whether an area is mainly urban - in which case there is more competition - or if it is mainly rural - in which case suppliers have higher transport costs and there is less competition.
Overall, the AA says the UK has the seventh-highest petrol price and the second-highest diesel price in Europe.
The fuel price data is supplied by the research firm Experian Catalist.
Higher pricesThe AA said further falls in petrol prices were unlikely, because of poor refinery capacity in the UK and the likely strengthening of the US dollar.
The US dollar is expected to rise in value now that the standoff over the country's budget is over and oil is priced in dollars.
The AA's president, Edmund King, said: "A more than £2.50-a-tank cut in petrol costs for families is a dramatic improvement on its own. But, heading into winter with cars using more fuel, the timing couldn't be better.
"Alongside Asda, Sainsbury's decision to fully reflect the fall in wholesale prices has been a huge benefit for drivers and businesses.
"However, the AA is also encouraged by the growing band of non-supermarket retailers challenging the pricing of other supermarkets whose prices in many places are far less generous," he added.
The organisation said that the situation at the Grangemouth refinery in Scotland, where a dispute between management and unions has led to a temporary closure, had highlighted the UK's lack of refinery capacity.
It urged the government to find ways to support domestic refineries
