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Cheapest Petrol & Diesel in Carmarthen Today

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Last updated: · Prices refresh every 30 minutes from the UK government's Fuel Finder service.

Cheapest Petrol in Carmarthen

Area average: 151.5p — save up to 1.6p/litre

Cheapest Diesel in Carmarthen

157.9p per litre at Murco, Carmarthen
Area average: 161.3p — save up to 3.4p/litre
See all 5 stations View on map 30-day trend Annual cost
Browse by brand: MorrisonsMurcoMurcoTescoTexaco

Worth the Drive?

Diesel averages 3.4p less in Llanllawddog (157.9p vs 161.3p here). The round trip is about 5 miles each way, costing roughly £1.49 in fuel at 50 mpg. A 60‑litre fill would save £2.04 — a net saving of £0.55 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 151.5p per litre across 5 stations. Diesel (B7) averages 161.3p across 5 stations. Unleaded is 1.6p below the national average of 153.1p.

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 149.9p Cheapest 165.9p 158.9p –
Murco, Carmarthen SA31 2EY 149.9p 159.5p 157.9p Cheapest 171.5p Cheapest
Murco, Carmarthen SA31 3HL Super-market 154.9p – 166.9p –
Tesco, Carmarthen SA31 3AX Super-market 149.9p 158.9p Cheapest 158.9p –
Texaco, Llangunnor Carmarthen SA31 2BN Super-market 152.9p 181.9p 163.9p –

Station Map

Nearby Towns

Llangunnor
3 stations
Unleaded avg 151.5p
Diesel avg 162.6p
Newchurch and Merthyr
1 stations
Unleaded avg 152.9p
Diesel avg 165.9p
Abergwili
1 stations
Unleaded avg 153.9p
Diesel avg 176.9p
Llanllawddog
1 stations
Unleaded avg 149.9p
Diesel avg 157.9p
Cynwyl Elfed
1 stations
Unleaded avg 149.9p
Diesel avg 161.9p
Pontyates
1 stations
Unleaded avg 151.9p
Diesel avg 167.9p
Llangyndeyrn
1 stations
Unleaded avg 151.9p
Diesel avg 167.9p
Tumble
1 stations
Unleaded avg 147.9p
Diesel avg 159.9p

Average Petrol and Diesel Prices in Carmarthen (pence per litre)

Unleaded (E10)
151.5p
5 stations
±2.1p std dev
1.6p below national
Super Unleaded (E5)
166.5p
4 stations
±9.3p std dev
5.0p below national
Diesel (B7)
161.3p
5 stations
±3.5p std dev
9.8p below national
Premium Diesel
171.5p
1 stations
20.3p below national

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 £2361/year on fuel in Carmarthen (at 151.5p/L). That's £25 less than the UK average of £2386. Across the wider Swansea (SA) postcode area petrol averages 152.7p/L, working out at £2380/year.

A diesel driver doing the same 12000 miles at 50 mpg spends about £1760/year at Carmarthen's average diesel price of 161.3p/L. That's £107 less than the UK average of £1867. Across the wider Swansea (SA) postcode area diesel averages 168.3p/L — £1836/year.

Choose the right station — save £££

The cheapest petrol in Carmarthen is 149.9p/L and the most expensive is 154.9p/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 9.0p/L (157.9p cheapest, 166.9p dearest) — £5.40 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 149.9p/L — 1.6p below the Carmarthen average. Diesel is 158.9p/L (2.4p below town avg). Live prices: Morrisons, Llangunnor. Morrisons fuel prices across the UK →

Show station details
StationPostcodeE10B7
Morrisons, Llangunnor SA31 2NF 149.9p 158.9p

Murco Fuel Prices in Carmarthen

There is 1 Murco forecourt in Carmarthen. Petrol is 149.9p/L — 1.6p below the Carmarthen average. Diesel is 157.9p/L (3.4p below town avg). Live prices: Murco, Carmarthen. Murco fuel prices across the UK →

Show station details
StationPostcodeE10B7
Murco, Carmarthen SA31 2EY 149.9p 157.9p

Murco Fuel Prices in Carmarthen

There is 1 Murco forecourt in Carmarthen. Petrol is 154.9p/L — 3.4p above the Carmarthen average. Diesel is 166.9p/L (5.6p above town avg). Live prices: Murco, Carmarthen. Murco fuel prices across the UK →

Show station details
StationPostcodeE10B7
Murco, Carmarthen SA31 3HL 154.9p 166.9p

Tesco Fuel Prices in Carmarthen

There is 1 Tesco forecourt in Carmarthen. Petrol is 149.9p/L — 1.6p below the Carmarthen average. Diesel is 158.9p/L (2.4p below town avg). Live prices: Tesco, Carmarthen. Tesco fuel prices across the UK →

Show station details
StationPostcodeE10B7
Tesco, Carmarthen SA31 3AX 149.9p 158.9p

Texaco Fuel Prices in Carmarthen

There is 1 Texaco forecourt in Carmarthen. Petrol is 152.9p/L — 1.4p above the Carmarthen average. Diesel is 163.9p/L (2.6p above town avg). Live prices: Texaco, Llangunnor. Texaco fuel prices across the UK →

Show station details
StationPostcodeE10B7
Texaco, Llangunnor SA31 2BN 152.9p 163.9p

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Frequently Asked Questions

The cheapest unleaded petrol (E10) in Carmarthen today is 149.9p per litre at MORRISONS, SA31 2NF. The average across 5 stations is 151.5p. Prices are sourced from the UK government's Fuel Finder service and updated every 30 minutes.

The cheapest diesel (B7) in Carmarthen today is 157.9p per litre at MURCO, SA31 2EY. The average across 5 stations is 161.3p. Prices are sourced from the UK government's Fuel Finder service.

The average unleaded (E10) price in Carmarthen is 151.5p per litre from 5 stations. The national average is 153.1p, so Carmarthen is 1.6p below the national average.

The average diesel (B7) price in Carmarthen is 161.3p per litre from 5 stations. The national average is 171.1p, so Carmarthen is 9.8p below the national average.

There are currently 5 fuel stations reporting prices in Carmarthen. This includes supermarket forecourts, independent stations, and branded sites.

Fuel prices on MPG Calc are updated every 30 minutes using official data from the UK government's Fuel Finder service. All retailers with 250+ filling stations are required by law to report their prices, covering the vast majority of UK forecourts.