Carmarthenshire has 43 forecourts. Below are the 36 within 20 km of its centre, with live prices.
TESCO, RHYDAMAN currently leads on price in Carmarthenshire at £1.64 — 5.5p below the city average. Filling a 55-litre tank here saves you £3.03 vs the average station.
The cheapest petrol in Carmarthenshire today is at TESCO, RHYDAMAN (SA18 2LR) at £1.64 per litre. Prices are updated live from the official UK Government Fuel Finder data.
The average petrol (E10) price in Carmarthenshire is currently £1.69 per litre, which is 0.5p below the UK national average of £1.70. Supermarket stations like Tesco and Asda typically offer the lowest prices.
The cheapest diesel (B7) in Carmarthenshire is currently £1.85 per litre at TESCO, RHYDAMAN. The average diesel price across Carmarthenshire is £1.92.
Fuel prices across Carmarthenshire are updated live. All major UK fuel retailers are legally required to report prices to the government's Fuel Finder scheme, which FuelSignal pulls from automatically.
Supermarket fuel stations — Tesco, Asda, Morrisons, and Sainsbury's — are almost always the cheapest in Carmarthenshire, typically 4–8p per litre below branded stations like Shell and BP. Among non-supermarket brands, JET and Gulf often offer competitive prices.
Carmarthenshire petrol prices are currently 0.5p per litre below the UK national average of £1.70. This makes it one of the more affordable areas for fuel in the UK.
To save money on petrol in Carmarthenshire: (1) Use supermarket stations which are typically 5–8p cheaper than branded forecourts. (2) Avoid filling up near motorway services which charge a significant premium. (3) Use FuelSignal to compare forecourts across Carmarthenshire and find the cheapest price near you before you travel.