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 8:01am on 19 September 2026.
The cheapest reported unleaded petrol (E10) in Porthmadog is £7.72 a gallon (169.9p per litre) at Tesco, Tesco Stores Ltd, Stryd Fawr, Porthmadog. The average across 3 forecourts currently reporting this grade is £7.91 a gallon (173.9p per litre), so choosing the cheapest rather than an average-priced forecourt saves about £2.00 on a 50-litre fill. That local average is 1.4p per litre above the UK average of 172.5p.
The average is unchanged since yesterday. The average has risen 6.7p per litre since last week.
Prices last refreshed at 8:01am on 19 September 2026, supplied through the official UK Government fuel price open data scheme and checked every 30 minutes.
At 169.9p per litre, the cheapest unleaded in Porthmadog is the highest we have recorded here in 4 weeks. The Porthmadog average has risen 4.0p a litre over the past week.
Unleaded Prices
Unleaded (E10)
- Highest
- £8.00/gal175.9p/L
- Average
- £7.91/gal173.9p/L
- Lowest
- £8.00/gal175.9p/L
Diesel Prices
Diesel (B7)
- Highest
- £9.09/gal199.9p/L
- Average
- £9.01/gal198.2p/L
- Lowest
- £9.09/gal199.9p/L
Premium Unleaded Prices
Premium Unleaded (E5)
- Highest
- £8.91/gal195.9p/L
- Average
- £8.56/gal188.4p/L
- Lowest
- £8.22/gal180.9p/L
Super Diesel Prices
Super Diesel (SDV)
- Highest
- £9.82/gal215.9p/L
- Average
- £9.82/gal215.9p/L
- Lowest
- £9.82/gal215.9p/L
All forecourts in Porthmadog
3 forecourts in Porthmadog, with live prices and full addresses. Showing 1 to 3.
Tesco Stores Ltd, Stryd Fawr, Porthmadog · LL49 9NU
Usually cheapest midnight to 5am, priciest 5pm to 10pm here
DirectionsDiesel B7
Premium E5
High Street, Porthmadog, Gwynedd · LL49 9LU
Usually cheapest midnight to 5am, priciest 11pm to midnight here
DirectionsDiesel B7
Premium E5
Super Diesel
Glanaber Garage, Borth-y-gest, Porthmadog, LL49 9TP, Porthmadog · LL49 9TP
Usually cheapest midnight to 5am, priciest 11am to 4pm here
DirectionsDiesel B7
Search near Porthmadog
Ask the fuel analyst
Answers come straight from recorded official price data, refreshed every 30 minutes.
Cheapest reported unleaded
Tesco
Tesco Stores Ltd, Stryd Fawr, Porthmadog
169.9p/L
Cheapest reported diesel
Tesco
Tesco Stores Ltd, Stryd Fawr, Porthmadog
194.9p/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 173.9p per litre (approx. £7.91/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 198.2p per litre (approx. £9.01/gal). This is based on live data from forecourts in the area, updated every 30 minutes.
- Which is the cheapest petrol station in Porthmadog?
- Tesco at Tesco Stores Ltd, Stryd Fawr, Porthmadog currently has the cheapest reported unleaded petrol in Porthmadog at 169.9p per litre (approx. £7.72/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, Mfg Porthmadog (LL49 9LU) currently has the highest reported unleaded (E10) price in Porthmadog at 175.9p per litre (approx. £8.00/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.