Cheapest fuel in Carmarthen

From the UK Government's Fuel Finder scheme. Every forecourt must report its pump prices within 30 minutes of a change, so these are the retailers' own prices, not estimates or crowdsourced reports.

We check the official feed every five minutes and show the time each price was set. If we haven't been able to update for 30 minutes, the page says so.

Yes. Every forecourt in the scheme is included. Type a postcode anywhere in the UK, or use your phone's location, and choose how far you're willing to drive.

Supermarkets and high-volume sites often price lower; motorway and small independent sites tend to be higher. Location, brand and the station's own costs all play a part. We list every station in the area so you can see the spread.

The arrow shows how a station's price has moved compared with seven days ago, based on our own daily records. The averages at the top are worked out the same way. These are our calculations, not part of the official data.

Yes. Under-inflated tyres cost up to 3% more fuel, so check your pressures once a month against the figures in your handbook or on the driver's door pillar. Carrying less weight and driving more smoothly help too.