Average daily petrol prices posted on the NRMA website show that on Monday, unleaded fuel prices across the state varied by 13.8 cents a litre, while diesel varied by 14.5 cents.

And Orange motorists were among the biggest winners in the fuel lottery, paying an average of 149.4 cents a litre compared to Sydney's 151.4 cents, Bathurst's 152.2 and Dubbo's 155.9.

NRMA Western NSW director Graham Blight said while petrol prices did not tend to rise in the school holidays, motorists needed to be aware of price differences.

He noted the NRMA’s online Bowser Buster, which ranks the weekly average unleaded petrol and diesel prices for more than 50 locations across NSW and the ACT, gave a good indication of the best places to fill up.

“It’s not the most current information ... but if they look back at previous weeks and months, they can see the trends and towns which are generally cheaper to fill up in,” he said.

“People should have a look and plan where is good to fill up, if they are driving down the road then and spot somewhere cheaper they know it’s a good price and can pull in.”

According to the latest data from the NRMA’s Bowser Buster, in the week ending June 23, Grafton was the cheapest place to buy unleaded petrol, while Orange ranked second, Bathurst 14th, Dubbo 19th and Lithgow was 43rd.

The data for seven weeks across May and June, showed Sydney was the cheapest place to buy unleaded petrol for three out of seven weeks.

During the same period Orange consistently ranked among the four cheapest locations, while Bathurst only ranked among the top 15 once.

Mr Blight said the cheaper prices in Orange and other locations came down to the same old story of competition.

“Orange has more competition than Bathurst, just one strong independent in Bathurst could change that though,” he said.

He advised motorists who were fed up with paying higher prices at the bowser, to post any lower petrol prices they saw on their social media accounts.

“If you see a good price tell your mates and give that station support, that’s a more useful status than the fact that you changed your hairstyle,” he said.