It was recently found that some supermarkets have been overcharging motorists for the fuel used in their cars by as much as 6p more per litre.

This was said to cost UK and Ayrshire drivers around £900 million a year, according to the government watchdog that made the findings.

Selecting the cheapest diesel and petrol can be a pain in the neck, meaning many of us are paying more than we need to on fuel.

Luckily, handy tools and apps like Confused.com allow customers to compare mainstream brands and supermarkets for the best deals.

Ardrossan and Saltcoats Herald: Supermarkets were recently found to have overcharged customers for filling up their cars (Canva)Supermarkets were recently found to have overcharged customers for filling up their cars (Canva) (Image: Canva)

Cheapest places to fill up your car with petrol or diesel in Ayrshire

Here are the cheapest places to fill your car up with petrol or diesel in Ayrshire.

These prices are correct at the time of writing.

Cheapest places in Ayrshire to fill your car up with diesel

The full list can be found on the app.

Jet Campbell's Garage (Hurlford Road, Kilmarnock)

135.9p

Tesco Extra (Holmquarry Road, Kilmarnock)

135.9p

ASDA (Queen's Drive, Kilmarnock)

136.7p

Morrisons (Bonnyton Road, Kilmarnock)

136.7p

Sainsbury's (Ayr Road, Irvine)

136.9p

ASDA (Liberator Drive, Ayr)

137.7p

Tesco Extra (Whitletts Road, Ayr)

137.9p

Sainsbury's (Ayr Road, Prestwick)

137.9p

Esso (Hillfoot Road, Ayr)

137.9p

Ardrossan and Saltcoats Herald: Costco in St Rollox, Glasgow, was found to have the cheapest petrol in the cityCostco in St Rollox, Glasgow, was found to have the cheapest petrol in the city (Image: Canva)

Cheapest places in Ayrshire to fill your car with unleaded petrol

Here are the cheapest stations for unleaded petrol:

Jet Cambell's Garage (Hurlford Road, Kilmarnock)

135.9p

ASDA (Queen's Drive, Kilmarnock)

136.9p

Morrisons (Bonnyton Road, Kilmarnock)

136.7p

Gulf (Ayr Road, Kilmarnock)

136.9p

Tesco Extra (Holmquarry Road, Kilmarnock)

136.9p

Esso (Rigg Street, Stewarton)

136.9p

ASDA (Liberator Drive, Ayr)

138.7p

Shell (Glencairn Street, Kilmarnock)

138.7p

Find out more on the Confused.com app or website.