Cheapest Petrol Prices in Carmarthenshire
Last updated: · 17 stations tracked
Cheapest Petrol (E10)
157.9p
per litre · avg 160.84p
Cheapest Diesel (B7)
178.9p
per litre · avg 182.08p
Compare live petrol and diesel prices across 17 fuel stations in Carmarthenshire. Prices are sourced from the UK Government's official fuel price database and updated every hour. The cheapest petrol in Carmarthenshire today is 157.9p per litre, available at GWALIA GARAGE.
Supermarket forecourts — including Tesco, Asda, and Sainsbury's — typically offer the lowest prices in Carmarthenshire. Motorway services and branded stations (BP, Shell, Esso) often charge a premium. Use the table below to find the best deal near you.
Fuel Station Prices in Carmarthenshire
| Station | Unleaded (E10) | Diesel (B7) | Super Unleaded | Premium Diesel |
|---|---|---|---|---|
| ASDA WHITE MILL EXPRESS PETROL | 165.9p | 184.9p | — | — |
| GWALIA GARAGE | 157.9p | 178.9p | 166.5p | 187.5p |
| TANERDY GARAGE | 158.9p | 178.9p | 167.5p | 186.5p |
| oil 4 wales ltd Nantycaws | 159.9p | 183.9p | — | — |
| VST TOWY SERVICES STATION | 159.9p | 179.9p | 184.9p | — |
| CARMARTHEN EXTRA - PETROL FILLING STATION | 161.9p | 182.9p | 171.9p | — |
| MFG MORRISONS CARMARTHEN | 160.9p | 181.9p | 175.9p | — |
| CKs Supermarket | 161.9p | 181.9p | — | — |
| Windy Corner Garage | 157.9p | 179.9p | — | — |
| Derwydd Services | 158.9p | 179.9p | 171.9p | 155.9p |
| LEWIS RETAIL DREFACH LTD | 159.9p | 181.9p | — | — |
| ASCONA TENBY ROAD SERVICE STATION | 162.9p | 182.9p | 194.9p | 214.9p |
| ASCONA GORSLAS SERVICE STATION | 159.9p | 181.9p | — | — |
| MFG CROSS HANDS | 159.9p | 181.9p | 175.9p | 195.9p |
| RONTEC CROSS HANDS | 159.9p | 181.9p | 178.9p | 200.9p |
| Llandeilo Service Station | 161.9p | 186.9p | — | — |
| ASDA PONTYATES EXPRESS PETROL | 165.9p | 184.9p | — | — |
Frequently Asked Questions
What is the cheapest petrol price in Carmarthenshire?
The cheapest petrol in Carmarthenshire is currently 157.9p per litre as of 4 September 2026. The average across all stations is 160.84p.
Which supermarket has the cheapest fuel in Carmarthenshire?
Tesco, Asda, and Sainsbury's supermarket forecourts typically offer the lowest fuel prices in Carmarthenshire. Check the price table above to compare all stations including branded and independent retailers.
How often are fuel prices updated for Carmarthenshire?
Prices are updated hourly from the UK Government's mandatory fuel price reporting scheme, which requires all fuel retailers with 6 or more sites to submit prices every 30 minutes.