The Federal Government wants petrol retailers to register their price 24 hours in advance, so people can choose where to buy the cheapest fuel.

The president of the NRMA Alan Evans says the scheme has worked well in Western Australia.

"Its operation in Western Australia we think has reduced the average price for motorists," he said.

"[It has] certainly got rid of some of those major problems of motorists driving up to a station in the morning to find the price has increased by 15 or 20 cents."

But others, like David Cumming from the Royal Automobile Club of Victoria (RACV), believe the monitoring system puts independent retailers at a disadvantage.

"If the independents go out of the market, there is no way in the world we are going to see cheaper prices," he said.

"It will deprive Victorians of their weekly cheaper prices."

The Federal Opposition's consumer affairs spokesman Luke Hartsuyker says there is doubt about whether Western Australians are better off as a result.

"We welcome any proposal that is going to provide concrete savings to motorists," he said.

"But the FuelWatch system certainly hasn't delivered guaranteed reductions for motorists in Western Australia."

The Opposition has asked the Government to guarantee fuel prices will be lower under the scheme.

-abc.net.au