Best fuel card in Carmarthen
Which business fuel cards work at Carmarthen's 7 forecourts, with diesel prices checked at 18:45 on 8 November.
Quick answer
Radius One and UK Fuels work at the most forecourts in Carmarthen: 2 of 7 each. The cheapest of those for diesel right now is Mfg Morrisons Carmarthen at 194.9p.
How we rank. Cards are ranked by how many Carmarthen forecourts take them, never by commission. PerMile may earn a commission if you apply through these links.
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Radius One
Best for petrol, diesel and electricFixed weekly priceWorks at 2 of 7 forecourts, possibly 5 more
Cheapest diesel where it works: Mfg Morrisons Carmarthen, 194.9p
A fixed price linked to the wholesale cost of fuel, set each week for the week ahead.
Apply - 2
UK Fuels
Best for the widest choice, including supermarketsFixed price or pump discountWorks at 2 of 7 forecourts, possibly 5 more
Cheapest diesel where it works: Mfg Morrisons Carmarthen, 194.9p
Either a fixed weekly price, or a set discount off the pump price, depending on the card.
Apply - 3
Truckone
Best for lorries and HGVsFixed weekly priceWorks at 1 of 7 forecourts, possibly 6 more
Cheapest diesel where it works: Mfg Morrisons Carmarthen,
Where each card works comes from each provider's published network, checked in November 2026. Networks change, so check the provider's site finder before you apply. Forecourt prices from the UK Government Fuel Finder scheme. Compare every card in detail · Diesel prices in Carmarthen
Questions about fuel cards in Carmarthen
What is the best fuel card in Carmarthen?
Radius One and UK Fuels work at the most forecourts in Carmarthen: 2 of 7 each. The cheapest of those for diesel right now is Mfg Morrisons Carmarthen at 194.9p.
How do you work out which fuel cards work in Carmarthen?
We take every forecourt in Carmarthen from the UK Government Fuel Finder scheme, look at its brand, and check it against where each card provider says its card is accepted. "Works at" means the provider says every site of that brand takes the card. "Possibly" means only some sites of that brand do, or the card's network includes independent sites.
Is a fixed weekly price or a pump price card better?
A fixed weekly price is easy to budget and can be below the average pump price. A pump price card with a discount lets you fill up at the widest choice of stations. If you mostly fill up in one town, pick the card that works at the forecourts you actually use.