Compare Tesco petrol and diesel prices across forecourts in and around Carmarthen, Swansea. Cheapest unleaded from 172.9p, diesel from 196.9p. Updated today, 23 October 2026.
| Forecourt | Unleaded | Diesel | Distance |
|---|---|---|---|
| CARMARTHEN EXTRA - PETROL FILLING STATION TESCO STORES |
172.9p | 196.9p | 1.3 mi |