Petrol (E10) prices in Carmarthenshire averaged 147.4p per litre in March 2026, up 13.3p from the previous period. The highest recorded price was 149.9p in March 2026.

Prices have been trending upward in Carmarthenshire recently. Drivers may want to shop around and compare prices between stations to find the best deal.

Over this period, Petrol (E10) prices in Carmarthenshire ranged from 129.9p to 149.9p per litre — a spread of 20.0p. This significant variation means it pays to compare prices between stations.