Live prices
Cheapest petrol and diesel prices in Merthyr Tydfil
3 forecourts tracked in Merthyr Tydfil (3 reporting unleaded (E10), 3 reporting diesel (B7), 2 reporting premium (E5), 1 reporting super diesel). Prices last refreshed at 4:01pm on 18 September 2026.
The cheapest reported unleaded petrol (E10) in Merthyr Tydfil is £7.86 a gallon (172.9p per litre) at Asda, Dowlais Top, Merthyr Tydfil. The average across 3 forecourts currently reporting this grade is £7.94 a gallon (174.6p per litre), so choosing the cheapest rather than an average-priced forecourt saves about £0.85 on a 50-litre fill. That local average is 2.1p per litre above the UK average of 172.5p.
The average has risen 0.4p per litre since yesterday. The average has risen 4.0p per litre since last week.
Prices last refreshed at 4:01pm on 18 September 2026, supplied through the official UK Government fuel price open data scheme and checked every 30 minutes.
At 172.9p per litre, the cheapest unleaded in Merthyr Tydfil is the highest we have recorded here in 4 weeks. The Merthyr Tydfil average has risen 3.7p a litre over the past week.
Unleaded Prices
Unleaded (E10)
- Highest
- £7.91/gal173.9p/L
- Average
- £7.94/gal174.6p/L
- Lowest
- £7.86/gal172.9p/L
Diesel Prices
Diesel (B7)
- Highest
- £9.04/gal198.9p/L
- Average
- £9.07/gal199.6p/L
- Lowest
- £9.00/gal197.9p/L
Premium Unleaded Prices
Premium Unleaded (E5)
- Highest
- £8.91/gal195.9p/L
- Average
- £8.88/gal195.4p/L
- Lowest
- £8.86/gal194.9p/L
Super Diesel Prices
Super Diesel (SDV)
- Highest
- £10.04/gal220.9p/L
- Average
- £10.04/gal220.9p/L
- Lowest
- £10.04/gal220.9p/L
All forecourts in Merthyr Tydfil
3 forecourts in Merthyr Tydfil, with live prices and full addresses. Showing 1 to 3.
Dowlais Top, Merthyr Tydfil · CF48 2YF
Usually cheapest 8am to 1pm, priciest 4pm to 9pm here
DirectionsDiesel B7
3 - 3A Lower High Street, Merthyr Tydfil, Glamorgan · CF47 8EB
Usually cheapest midnight to 5am, priciest 5pm to 10pm here
DirectionsDiesel B7
Premium E5
New Road, Merthyr Tydfil, Mid Glamorgan · CF48 3DA
Usually cheapest midnight to 5am, priciest 3pm to 8pm here
DirectionsDiesel B7
Premium E5
Super Diesel
Search near Merthyr Tydfil
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Answers come straight from recorded official price data, refreshed every 30 minutes.
Cheapest reported unleaded
Asda
Dowlais Top, Merthyr Tydfil
172.9p/L
Cheapest reported diesel
Asda
Dowlais Top, Merthyr Tydfil
197.9p/L
By fuel grade in Merthyr Tydfil
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Prices are sourced from official UK government fuel-price data (Open Government Licence v3.0). Updated every 30 minutes.
Questions about fuel prices in Merthyr Tydfil
- What is the average petrol price in Merthyr Tydfil?
- The average unleaded (E10) petrol price in Merthyr Tydfil is currently 174.6p per litre (approx. £7.94/gal), based on live data from 3 forecourts reporting this grade. Prices are updated every 30 minutes from official UK government data.
- What is the average diesel price in Merthyr Tydfil?
- The average diesel (B7) price in Merthyr Tydfil is currently 199.6p per litre (approx. £9.07/gal). This is based on live data from forecourts in the area, updated every 30 minutes.
- Which is the cheapest petrol station in Merthyr Tydfil?
- Asda at Dowlais Top, Merthyr Tydfil currently has the cheapest reported unleaded petrol in Merthyr Tydfil at 172.9p per litre (approx. £7.86/gal). Prices change regularly, so check this page for the latest.
- Which is the most expensive petrol station in Merthyr Tydfil?
- According to official UK government fuel price data, Rontec Dowlais (CF48 3DA) currently has the highest reported unleaded (E10) price in Merthyr Tydfil at 176.9p per litre (approx. £8.04/gal). Prices are refreshed every 30 minutes, so this can change through the day.
- How do I find the cheapest fuel near Merthyr Tydfil?
- Use the search box above to enter your postcode. fuel.co.uk will show you every forecourt ranked cheapest first, with live prices updated every 30 minutes from the GOV.UK Fuel Finder.