SA motorists urged to fill up

Adelaide motorists are being urged to fill up with low petrol prices across the city ahead of the long weekend.

Prices in the northern suburbs have dropped to $1.19 or lower, matching those in other suburbs, the Royal Automobile Association says.

A market comparison group says Adelaide has enjoyed much lower prices than the other capitals during September.

The average price in Adelaide during the month was $1.19 compared to $1.36 in Melbourne, Sydney and Perth and almost $1.42 in Brisbane, comparethemarket.com.au says.