Motorists are being urged to fill up at the bowser now as already-rising petrol prices are set to spike within days across Melbourne, Brisbane and Sydney.

Although prices are currently falling in these three major cities, they are expected to increase again by the weekend, according to the NRMA.

The NRMA’s Peter Khoury said motorists could be paying a $20 difference for a standard tank.

Australia's biggest cities paying the most at petrol pump
Australia’s biggest cities paying the most at petrol pump (Nine)

In Sydney, the average price of regular unleaded petrol is currently 178 cents per litre.

Melbourne is seeing slightly lower prices, with the average at 175 cents per litre, while in Brisbane, the average stands at 199 cents per litre.

“If you’re in Sydney it is already starting to jump but 178 cents in Sydney is better than what’s going to come,” Khoury said.

“We have also seen some better prices in Melbourne and Brisbane because they are at the bottom of their cycles.”

By the weekend, petrol prices are expected to rise above $2 per litre

Motorists who use price tracking apps are more likely to find cheaper petrol, with more than 40 apps available to show current prices.

The ACCC is encouraging all drivers to use these apps to stay informed.

You May Also Like

Ainsley Earhardt's Slip-Up Talking About Her Divorce From Will Proctor Says So Much

John Lamparski/Getty Images Ainsley…

Billionaire fraudster Elizabeth Holmes seen enjoying facilities at Ghislaine Maxwell’s cushy new prison

Blood tech fraudster Elizabeth Holmes was spotted enjoying some leisure time at…

Man dies after car crashes into tree in Brisbane

The crash took place on Earnshaw Road at Northgate around 10.10pm yesterday.…

Former Fox host Jeanine Pirro confirmed as DC US Attorney after tense partisan struggle

Jeanine Pirro — the former Fox News firebrand and onetime New York…