Caltex and BP service stations are selling petrol for 30 cents more than nearby competitors – which could add $29 to a fuel bill.

Average fuel prices across Australia have fallen during the past fortnight after reaching the highest level in more than a decade.

Some service stations, however, have been a little slow in adjusting their prices.

Caltex and BP service stations are selling petrol for 30 cents more than nearby competitors – which could add $29 to a fuel bill (stock image)

Near Sydney airport, the Caltex at Mascot was on Thursday morning selling unleaded petrol for 161.9 cents a litre.

Just one suburb away at Sydenham, Payless Fuel was offering the same product for just 125.7 cents a litre – a difference of 36.2 cents a litre.

A motorist filling up a Toyota Hilux ute, Australia’s top-selling car, would save $29 by shopping at the cheaper service station.

A Daily Mail Australia analysis of Motor Mouth unleaded petrol price data found less dramatic price differences between service stations in Melbourne and Brisbane.

Near Sydney airport, the Caltex at Mascot (pictured) was on Thursday morning selling unleaded petrol for 161.9 cents a litre

Adelaide, however, was a different story with Caltex at Holden Hill selling unleaded for 129.8 cents a litre.

Across the city, in more upmarket suburbs, BP in Mawson Lakes and Coles Express in Hawthorn were selling petrol for 163.9 cents a litre on Thursday morning.

A CommSec analysis found unleaded prices across Australia had fallen by 11.1 cents a litre during the past fortnight, after reaching the highest levels since 2008.

During the past week alone, national average petrol prices have fallen by 6.7 cents a litre to 149.4 cents a litre – the steepest weekly drop since the last week of November a decade ago.

Adelaide had Australia’s most dramatic plunge, with bowser prices down 19.2 cents a litre.

Petrol prices during the past week have fallen by 9.8 cents a litre in Sydney, 8.8 cents a litre in Brisbane and 5.5 cents a litre in Melbourne.

The fluctuation was minimum in Hobart, Canberra and Darwin, which don’t have the same discount cycles as Australia’s biggest cities.

Just one suburb away at Sydenham, Payless Fuel (pictured) was offering the same product for just 125.7 cents a litre – a difference of 36.2 cents a litre

Average national wholesale unleaded petrol prices, also known as the terminal gate price, fell by 4.2 cents a litre to 132 cents a litre in the week to November 12.

The gap between wholesale and retail prices was 17.4 cents.

CommSec senior economist Ryan Felsman said  $1.50 a litre was the ‘new normal’ for Australian petrol prices.

Caltex declined to comment to Daily Mail Australia.

Extracted from Daily Mail