Cheapest Petrol & Diesel in Carmarthen Today
☆ SaveLast updated: · Prices refresh every 30 minutes from the UK government's Fuel Finder service.
Cheapest Petrol in Carmarthen
Cheapest Diesel in Carmarthen
Worth the Drive?
Petrol averages 5.4p less in Cynwyl Elfed (151.9p vs 157.3p here). The round trip is about 6 miles each way, costing roughly £2.51 in fuel at 35 mpg. A 60‑litre fill would save £3.24 — a net saving of £0.73 after the return journey.
Diesel averages 3.6p less in Llanllawddog (165.9p vs 169.5p here). The round trip is about 5 miles each way, costing roughly £1.57 in fuel at 50 mpg. A 60‑litre fill would save £2.16 — a net saving of £0.59 after the return journey.
There are 5 fuel stations in Carmarthen reporting live prices via the UK government's Fuel Finder service. Unleaded petrol (E10) averages 157.3p per litre across 5 stations. Diesel (B7) averages 169.5p across 5 stations. Unleaded is 1.5p above the national average of 155.8p.
Use our fuel station finder to find the most economical place to fill up near you, or calculate the fuel cost of a longer trip from Carmarthen.
Fuel Stations in Carmarthen
| Station | Postcode | E10 | E5 | B7 | SDV |
|---|---|---|---|---|---|
| Morrisons, Llangunnor Carmarthen | SA31 2NF Super-market | 153.9p Cheapest | 169.9p | 165.9p Cheapest | – |
| Murco, Carmarthen | SA31 2EY | 153.9p | 164.5p | 165.9p | 187.5p Cheapest |
| Murco, Carmarthen | SA31 3HL Super-market | 156.9p | – | 177.9p | – |
| Tesco, Carmarthen | SA31 3AX Super-market | 153.9p | 162.9p Cheapest | 167.9p | – |
| Texaco, Llangunnor Carmarthen | SA31 2BN Super-market | 167.9p | 181.9p | 169.9p | – |
Station Map
Nearby Towns
Average Petrol and Diesel Prices in Carmarthen (pence per litre)
30-Day Price Trend in the Swansea Region (pence per litre)
Daily averages across all stations in the Swansea postcode area over the last 30 days. Carmarthen sits within this region.
What does fuel cost a typical driver in Carmarthen?
At current prices, a typical driver covering 12000 miles a year in a petrol car averaging 35 mpg spends about £2452/year on fuel in Carmarthen (at 157.3p/L). That's £23 more than the UK average of £2428. Across the wider Swansea (SA) postcode area petrol averages 155.4p/L, working out at £2422/year.
A diesel driver doing the same 12000 miles at 50 mpg spends about £1849/year at Carmarthen's average diesel price of 169.5p/L. That's £80 less than the UK average of £1929. Across the wider Swansea (SA) postcode area diesel averages 174.1p/L — £1900/year.
Choose the right station — save £££
The cheapest petrol in Carmarthen is 153.9p/L and the most expensive is 167.9p/L — a 14.0p/L spread. Filling a 60‑litre tank at the cheapest vs the dearest saves £8.40.
For diesel the spread is 12.0p/L (165.9p cheapest, 177.9p dearest) — £7.20 saved on a 60‑litre fill.
Fuel Prices by Brand in Carmarthen
Average prices and cheapest station for each fuel brand in Carmarthen.
Morrisons Fuel Prices in Carmarthen
There is 1 Morrisons forecourt in Carmarthen. Petrol is 153.9p/L — 3.4p below the Carmarthen average. Diesel is 165.9p/L (3.6p below town avg). Live prices: Morrisons, Llangunnor. Morrisons fuel prices across the UK →
Show station details
| Station | Postcode | E10 | B7 |
|---|---|---|---|
| Morrisons, Llangunnor | SA31 2NF | 153.9p | 165.9p |
Murco Fuel Prices in Carmarthen
There is 1 Murco forecourt in Carmarthen. Petrol is 153.9p/L — 3.4p below the Carmarthen average. Diesel is 165.9p/L (3.6p below town avg). Live prices: Murco, Carmarthen. Murco fuel prices across the UK →
Show station details
| Station | Postcode | E10 | B7 |
|---|---|---|---|
| Murco, Carmarthen | SA31 2EY | 153.9p | 165.9p |
Murco Fuel Prices in Carmarthen
There is 1 Murco forecourt in Carmarthen. Petrol is 156.9p/L — 0.4p below the Carmarthen average. Diesel is 177.9p/L (8.4p above town avg). Live prices: Murco, Carmarthen. Murco fuel prices across the UK →
Show station details
| Station | Postcode | E10 | B7 |
|---|---|---|---|
| Murco, Carmarthen | SA31 3HL | 156.9p | 177.9p |
Tesco Fuel Prices in Carmarthen
There is 1 Tesco forecourt in Carmarthen. Petrol is 153.9p/L — 3.4p below the Carmarthen average. Diesel is 167.9p/L (1.6p below town avg). Live prices: Tesco, Carmarthen. Tesco fuel prices across the UK →
Show station details
| Station | Postcode | E10 | B7 |
|---|---|---|---|
| Tesco, Carmarthen | SA31 3AX | 153.9p | 167.9p |
Texaco Fuel Prices in Carmarthen
There is 1 Texaco forecourt in Carmarthen. Petrol is 167.9p/L — 10.6p above the Carmarthen average. Diesel is 169.9p/L (0.4p above town avg). Live prices: Texaco, Llangunnor. Texaco fuel prices across the UK →
Show station details
| Station | Postcode | E10 | B7 |
|---|---|---|---|
| Texaco, Llangunnor | SA31 2BN | 167.9p | 169.9p |
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