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?
Diesel averages 4.0p less in Llanllawddog (154.9p vs 158.9p here). The round trip is about 4 miles each way, costing roughly £1.15 in fuel at 50 mpg. A 60‑litre fill would save £2.40 — a net saving of £1.25 after the return journey.
There are 9 fuel stations in Carmarthen reporting live prices via the UK government's Fuel Finder service. Unleaded petrol (E10) averages 148.6p per litre across 9 stations. Diesel (B7) averages 158.9p across 9 stations. Unleaded is 2.6p below the national average of 151.2p.
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 |
|---|---|---|---|---|---|
| Esso, Abergwili Carmarthen | SA32 7EN | 151.9p | – | 171.9p | – |
| Morrisons, Llangunnor Carmarthen | SA31 2NF Super-market | 147.9p | 165.9p | 156.9p | – |
| Murco, Carmarthen | SA31 2EY | 146.9p Cheapest | 154.5p Cheapest | 154.9p Cheapest | 162.5p Cheapest |
| Murco, Llanllawddog Carmarthen | SA32 7DR | 146.9p | 154.5p | 154.9p | 162.5p |
| Murco, Carmarthen | SA31 3HL Super-market | 149.9p | – | 158.9p | – |
| Murco, Cynwyl Elfed Carmarthen | SA33 6TP Super-market | 147.9p | 161.9p | 157.9p | – |
| Tesco, Caerfyrddin Carmarthen | SA31 3AX Super-market | 147.9p | 157.9p | 156.9p | – |
| Texaco, Llangunnor Carmarthen | SA31 2BN Super-market | 147.9p | 179.9p | 157.9p | – |
| Valero, Newchurch and Merthyr Carmarthen | SA33 5DT | 149.9p | 187.9p | 159.9p | 211.9p |
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 £2316/year on fuel in Carmarthen (at 148.6p/L). That's £41 less than the UK average of £2357. Across the wider Swansea (SA) postcode area petrol averages 150.3p/L, working out at £2343/year.
A diesel driver doing the same 12000 miles at 50 mpg spends about £1734/year at Carmarthen's average diesel price of 158.9p/L. That's £65 less than the UK average of £1799. Across the wider Swansea (SA) postcode area diesel averages 162.2p/L — £1770/year.
Choose the right station — save £££
The cheapest petrol in Carmarthen is 146.9p/L and the most expensive is 151.9p/L — a 5.0p/L spread. Filling a 60‑litre tank at the cheapest vs the dearest saves £3.00.
For diesel the spread is 17.0p/L (154.9p cheapest, 171.9p dearest) — £10.20 saved on a 60‑litre fill.
Fuel Prices by Brand in Carmarthen
Average prices and cheapest station for each fuel brand in Carmarthen.
Murco Fuel Prices in Carmarthen
There are 2 Murco forecourts in Carmarthen. Petrol averages 146.9p/L — 1.7p below the Carmarthen average. Diesel averages 154.9p/L (4.0p below town avg). Cheapest petrol: Murco, Carmarthen at 146.9p. Murco fuel prices across the UK →
Show 2 Murco stations
| Station | Postcode | E10 | B7 |
|---|---|---|---|
| Murco, Carmarthen | SA31 2EY | 146.9p | 154.9p |
| Murco, Llanllawddog | SA32 7DR | 146.9p | 154.9p |
Murco Fuel Prices in Carmarthen
There are 2 Murco forecourts in Carmarthen. Petrol averages 148.9p/L — 0.3p above the Carmarthen average. Diesel averages 158.4p/L (0.5p below town avg). Cheapest petrol: Murco, Cynwyl Elfed at 147.9p. Murco fuel prices across the UK →
Show 2 Murco stations
| Station | Postcode | E10 | B7 |
|---|---|---|---|
| Murco, Carmarthen | SA31 3HL | 149.9p | 158.9p |
| Murco, Cynwyl Elfed | SA33 6TP | 147.9p | 157.9p |
Esso Fuel Prices in Carmarthen
There is 1 Esso forecourt in Carmarthen. Petrol is 151.9p/L — 3.3p above the Carmarthen average. Diesel is 171.9p/L (13.0p above town avg). Live prices: Esso, Abergwili. Esso fuel prices across the UK →
Show station details
| Station | Postcode | E10 | B7 |
|---|---|---|---|
| Esso, Abergwili | SA32 7EN | 151.9p | 171.9p |
Morrisons Fuel Prices in Carmarthen
There is 1 Morrisons forecourt in Carmarthen. Petrol is 147.9p/L — 0.7p below the Carmarthen average. Diesel is 156.9p/L (2.0p below town avg). Live prices: Morrisons, Llangunnor. Morrisons fuel prices across the UK →
Show station details
| Station | Postcode | E10 | B7 |
|---|---|---|---|
| Morrisons, Llangunnor | SA31 2NF | 147.9p | 156.9p |
Tesco Fuel Prices in Carmarthen
There is 1 Tesco forecourt in Carmarthen. Petrol is 147.9p/L — 0.7p below the Carmarthen average. Diesel is 156.9p/L (2.0p below town avg). Live prices: Tesco, Caerfyrddin. Tesco fuel prices across the UK →
Show station details
| Station | Postcode | E10 | B7 |
|---|---|---|---|
| Tesco, Caerfyrddin | SA31 3AX | 147.9p | 156.9p |
Texaco Fuel Prices in Carmarthen
There is 1 Texaco forecourt in Carmarthen. Petrol is 147.9p/L — 0.7p below the Carmarthen average. Diesel is 157.9p/L (1.0p below town avg). Live prices: Texaco, Llangunnor. Texaco fuel prices across the UK →
Show station details
| Station | Postcode | E10 | B7 |
|---|---|---|---|
| Texaco, Llangunnor | SA31 2BN | 147.9p | 157.9p |
Valero Fuel Prices in Carmarthen
There is 1 Valero forecourt in Carmarthen. Petrol is 149.9p/L — 1.3p above the Carmarthen average. Diesel is 159.9p/L (1.0p above town avg). Live prices: Valero, Newchurch and Merthyr. Valero fuel prices across the UK →
Show station details
| Station | Postcode | E10 | B7 |
|---|---|---|---|
| Valero, Newchurch and Merthyr | SA33 5DT | 149.9p | 159.9p |
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