NRMA's Weekly Petrol Report recorded fuel cost at 132.0 cents per litre (cpl) in Lithgow in the week ending of February 9. The prior week it was at 137.0 cpl.

In the matter of two weeks it dropped 5.0 cpl.

Tweed Heads South, Goulburn, Gunnedah and the Central Coast followed after Lithgow in the top five cheapest locations to fill up your tanks.

Lithgow was also ranked as the third cheapest location for diesel at a cost of 145.5 cpl.

READ MORE: Wet weather doesn't dampen spirits at 98th annual Rydal Show

Gunnedah was ranked as the top location for the cheapest diesel followed by Moama, Sydney and Wollongong.

NRMA spokesperson Bridget Ahern said Lithgow was lucky to have prices fall in the past week.

"We know that Lithgow is one of the most competitive markets in the Central West.

READ MORE: Royal visit will be locked down 'soon'

"It's the cheapest in the region by a long shot," she said.

Ms Ahern said on average people were paying $1.40 in locations such as Bathurst and prices were creeping up out West and in Sydney.

"It'll pay off for motorists if they fill up in Lithgow before heading further out West.

"However fuel prices in regional areas are dropping compared to an increase in Sydney," she said.

READ MORE: Lithgow residents call for 24/7 air quality monitoring in the region

"I don't think Lithgow will get much cheaper than this."

Ms Ahern advised motorists to download the NRMA app and check out fuel prices in areas they are travelling to.

"Shop around to find your cheapest option, that 20 cent saving can be decent when filling up a big tank," she said.

Subscribing means more than just website access. Read the print paper online, enter giveaways and more for just $2 a week, cheaper than a coffee. What are you waiting for?