Petrol Stations in CARMARTHEN
Compare live petrol and diesel prices at 7 petrol stations in CARMARTHEN. Cheapest fuel near you, updated every 5 minutes.
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19°C
Mainly clear
Avg Unleaded
149.5p
Avg Diesel
160.3p
Cheapest Unleaded
147.9p
Cheapest Diesel
155.9p
Fuel Prices by Brand in CARMARTHEN
All Stations in CARMARTHEN
GWALIA GARAGE
Murco · SA32 7DR
Unleaded
147.9p
Diesel
155.9p
TANERDY GARAGE
Murco · SA31 2EY
Unleaded
147.9p
Diesel
155.9p
MFG MORRISONS CARMARTHEN
Morrisons · SA31 2NF
Unleaded
148.9p
Diesel
157.9p
CKs Supermarket
Murco · SA31 3HL
Unleaded
149.9p
Diesel
158.9p
ASCONA TENBY ROAD SERVICE STATION
Valero · SA33 5DT
Unleaded
149.9p
Diesel
159.9p
Derwydd Services
Murco · SA33 6TP
Unleaded
149.9p
Diesel
161.9p
ASDA WHITE MILL EXPRESS PETROL
Esso · SA32 7EN
Unleaded
151.9p
Diesel
171.9p
Brands in CARMARTHEN
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Guide to Fuel Prices in CARMARTHEN
CARMARTHEN has 7 petrol stationsreporting live prices through the UK government's mandatory fuel price transparency scheme. Average unleaded (E10) is currently 149.5p per litre, with diesel (B7) at 160.3p per litre. The cheapest unleaded right now is 147.9p at GWALIA GARAGE (SA32 7DR).
1 of CARMARTHEN's 7stations are supermarket forecourts (Tesco, Asda, Morrisons, Sainsbury's, Costco), with branded retailers operating the other 6. Supermarket forecourts are 0.7p per litre cheaper than branded stations on average — a £0.39 saving on a typical 55-litre fill.
Nearby towns with cheaper unleaded: Ammanford (149.4p, 14.9 mi). A short detour can save up to £0.05on a 55-litre fill — though factor in fuel for the round trip.
Across all UK cities tracked by PetrolFinder, CARMARTHEN unleaded is 1.9p below the national average of 151.4p — driven by the local mix of supermarket vs branded forecourts and competition between 4 fuel brands operating in the area. Use the route planner to find the cheapest stop on your journey, or browse the price heatmap to spot regional bargains.
CARMARTHEN Snapshot
Stations7
Avg Unleaded149.5p
Cheapest Unleaded147.9p
Avg Diesel160.3p
Cheapest Diesel155.9p
Brands4
Petrol & Diesel FAQs for CARMARTHEN
Where is the cheapest petrol in CARMARTHEN?
The cheapest unleaded (E10) petrol in CARMARTHEN is currently 147.9p per litre at GWALIA GARAGE (SA32 7DR). The average across 7 stations in CARMARTHEN is 149.5p per litre. Prices update every 5 minutes from official UK government data.
Where is the cheapest diesel in CARMARTHEN?
The cheapest diesel in CARMARTHEN is currently 155.9p per litre, with an average of 160.3p across 7 stations. That's 6.9p below the UK national diesel average of 167.2p.
Are supermarket petrol stations cheaper in CARMARTHEN?
In CARMARTHEN, supermarket forecourts (1 stations: Tesco, Asda, Morrisons, Sainsbury's, Costco) are 0.7p per litre cheaper than branded retailers like Shell, BP and Esso (6 stations). That's a £0.39 saving on a typical 55-litre fill.
Which towns near CARMARTHEN have cheaper petrol?
Ammanford (149.4p, 14.9 mi) all have lower average unleaded prices than CARMARTHEN's 149.5p. A short detour can save up to £0.05 on a 55-litre fill — factor in fuel for the round trip.
How often are CARMARTHEN fuel prices updated?
Prices for the 7 petrol stations in CARMARTHEN are updated every 5 minutes using the UK Government Fuel Finder API under The Motor Fuel Price (Open Data) Regulations 2025. Retailers are legally required to report price changes within 30 minutes.