Live prices
Cheapest petrol and diesel prices in Porthmadog
3 forecourts tracked in Porthmadog (3 reporting unleaded (E10), 3 reporting diesel (B7), 2 reporting premium (E5), 1 reporting super diesel). Prices last refreshed at 12:05am on 5 November 2026.
The cheapest reported unleaded petrol (E10) in Porthmadog is £7.63 a gallon (167.9p per litre) at Shell, High Street, Porthmadog, Gwynedd. The average across 3 forecourts currently reporting this grade is £7.71 a gallon (169.6p 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 1.4p per litre below the UK average of 171.0p.
The average is unchanged since yesterday. The average has fallen 3.6p per litre since last week.
Prices last refreshed at 12:05am on 5 November 2026, supplied through the official UK Government fuel price open data scheme and checked every 30 minutes.
At 167.9p per litre, the cheapest unleaded in Porthmadog is the lowest we have recorded here in 4 weeks. The Porthmadog average has fallen 3.7p a litre over the past week.
Unleaded Prices
Unleaded (E10)
- Highest
- £7.63/gal167.9p/L
- Average
- £7.71/gal169.6p/L
- Lowest
- £7.63/gal167.9p/L
Diesel Prices
Diesel (B7)
- Highest
- £9.18/gal201.9p/L
- Average
- £9.07/gal199.6p/L
- Lowest
- £9.09/gal199.9p/L
Premium Unleaded Prices
Premium Unleaded (E5)
- Highest
- £9.09/gal199.9p/L
- Average
- £8.61/gal189.4p/L
- Lowest
- £8.13/gal178.9p/L
Super Diesel Prices
Super Diesel (SDV)
- Highest
- £10.00/gal219.9p/L
- Average
- £10.00/gal219.9p/L
- Lowest
- £10.00/gal219.9p/L
All forecourts in Porthmadog
3 forecourts in Porthmadog, with live prices and full addresses. Showing 1 to 3.
High Street, Porthmadog, Gwynedd · LL49 9LU
Usually cheapest 11pm to midnight, priciest midnight to 5am here
DirectionsDiesel B7
Premium E5
Super Diesel
Tesco Stores Ltd, Stryd Fawr, Porthmadog · LL49 9NU
Usually cheapest 6pm to 11pm, priciest midnight to 5am here
DirectionsDiesel B7
Premium E5
Diesel B7
Search near Porthmadog
Ask the fuel analyst
Answers come straight from recorded official price data, refreshed every 30 minutes.
Cheapest reported unleaded
Shell
High Street, Porthmadog, Gwynedd
167.9p/L
Cheapest reported diesel
Tesco
Tesco Stores Ltd, Stryd Fawr, Porthmadog
196.9p/L
By fuel grade in Porthmadog
Save more as a driver
Prices are sourced from official UK government fuel-price data (Open Government Licence v3.0). Updated every 30 minutes.
Questions about fuel prices in Porthmadog
- What is the average petrol price in Porthmadog?
- The average unleaded (E10) petrol price in Porthmadog is currently 169.6p per litre (approx. £7.71/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 Porthmadog?
- The average diesel (B7) price in Porthmadog 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 Porthmadog?
- Shell at High Street, Porthmadog, Gwynedd currently has the cheapest reported unleaded petrol in Porthmadog at 167.9p per litre (approx. £7.63/gal). Prices change regularly, so check this page for the latest.
- Which is the most expensive petrol station in Porthmadog?
- According to official UK government fuel price data, Glanaber Garage (LL49 9TP) currently has the highest reported unleaded (E10) price in Porthmadog at 172.9p per litre (approx. £7.86/gal). Prices are refreshed every 30 minutes, so this can change through the day.
- How do I find the cheapest fuel near Porthmadog?
- 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.