Data has shown Perth has had the cheapest petrol this year.

National Roads and Motorists Association spokesperson, Peter Khoury, says on average, unleaded petrol is Perth is 10 cents a litre cheaper compared to the most expensive city.

“There’s always going to be a disparity among the capital cities and also across regional centres,” he told 6PR Mornings.

Press PLAY to hear why there’s a disparity between capital cities and regional centres + where it was the most expensive to fill up

Image: iStock.