The Federal Opposition is demanding the Prime Minister name a petrol price reduction target for his national rollout of a scheme aimed at cutting costs for consumers.
Retailers must register their prices 24 hours in advance under the Government plan, allowing customers to use the internet to find the cheapest fuel.
Some motoring groups believe it will lead to an end to the weekly price dip on a Tuesday and others say the monitoring system puts independent retailers at a disadvantage.
Opposition finance spokesman Peter Dutton has told ABC Radio's AM program he wants the Government to guarantee no-one will be worse off.
"In Sydney alone, we know that on Tuesday, 10 million litres are pumped into people's tanks, compared to 5 million litres on a Thursday," he said.
"That's replicated in other major cities in eastern states and those people, with no question at all, will be paying more for their petrol under FuelWatch than they do at the moment."
New South Wales Service Station Association president Craig Glasby says that low point could go up by two cents.
Mr Glasby says FuelWatch, which is based on a scheme already operating in Western Australia, may not lead to any price reductions.
"Over in the east coast, we have a more competitive market than there is over in the west coast, so we're not sure it's going to actually do anything number one," he said.
"Number two, we think it's going to impose problems for the independent market."
But NRMA president Alan Evans says that is propaganda.
"The fact of the matter is, when you look at Western Australia, the research shows quite clearly that it improved the competitive position in Western Australia," he said.
"Indeed, Perth enjoys lower prices than Sydney...
"[Service stations] are going to have to think, they're going to have to plan and they're going to have to make sure they're starting out the day at the best price."
The scheme will be introduced by the end of the year.
-abc.net.au
