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The RAC has warned that comments from David Cameron that fuel prices should fall "further and faster" may end up confusing drivers and stoking unrealistic expectations.
Speaking at Prime Minister's Questions today, Mr Cameron said: "We're beginning to see prices fall quite substantially at the pumps but...we want to see that go further and faster."
His comments came as it emerged a petrol station in Birmingham is now selling unleaded for just 99.7p a litre.
RAC fuel spokesman Simon Williams criticised the remarks, saying:
Mr Williams said despite falling global oil prices there is "a limit to which further falls can benefit pump prices".
The price of Brent crude oil prices has fallen below $50 (£33) a barrel for the first time since May 2009.
Benchmark Brent crude futures fell more than a dollar to $49.92 a barrel this morning, later rising back above $50.
Analysts said that further price falls were likely because of an excess of supply and sluggish demand
Shippers, airlines and motorists stand to gain from the fall.
Bank of England governor Mark Carney said last month that the oil price slide was a "net positive development" for the UK.
The body that represents the UK energy industry insists that falls in global oil prices are being passed on to customers.
Energy UK chief executive Lawrence Slade said:
Chancellor George Osborne has announced a review of the impact of items such as fuel bills, air fares and the forecourt price of petrol.
Mr Osborne welcomed a move by four major supermarkets to cut 2p from the cost of a litre of petrol as the slump left a barrel of Brent crude trading at about 52 US dollars a barrel, the lowest since May 2009, but said more action was required.
After leading a Cabinet discussion on the issue he tweeted that it was "vital" that lower wholesale prices were passed on to consumers.
A Treasury spokesman said: "The Government is conducting studies of industries like the utilities and the airlines. We are examining if any action needs to be taken."
Families must benefit from the fall in oil prices in their heating bills and airline tickets, Danny Alexander has told ITV News.
Mr Alexander's comments come after oil prices tumbled to their lowest level in nearly six years.
Speaking to Business Editor Joel Hills, the Chief Secretary to the Treasury said: "The fall in oil price is a benefit to most of the UK economy provided that the benefits are passed on at the pumps, in the cost of holidays and in the cost of heating homes."
The cost of crude oil has hit its lowest level for five years prompting another volatile day on the world's stock markets.
ITV News' Consumer Editor Chris Choi reports on the pros and cons of falling oil prices.
Latest ITV News reports
Danny Alexander has told ITV News he wants companies to do more to pass on savings from the fall in the price of oil to their customers now.