Filling up your car north of the Brisbane River will cost you more, according to an analysis of petrol prices.

The RACQ's June fuel price report showed motorists on the northside paid 3.6 cents per litre more on average for unleaded petrol than those on the southside.

It is more expensive to buy petrol in Brisbane's north versus south. But the Gold Coast is the cheapest place to fill up in south-east Queensland. Credit:Patrick Cummins

It comes as Queenslanders continue to wait for the government's promised trial of fuel price monitoring.

RACQ spokeswoman Lucinda Ross said the insurer had noticed a real north-versus-south divide in terms of fuel pricing.