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 8:02pm on 30 July 2026.
The cheapest reported unleaded petrol (E10) in Porthmadog is 149.9p per litre at TESCO, TESCO STORES LTD, STRYD FAWR, PORTHMADOG. The average across 3 forecourts currently reporting this grade is 155.9p per litre, so choosing the cheapest rather than an average-priced forecourt saves about £3.00 on a 50-litre fill. That local average is 3.9p per litre below the UK average of 159.8p.
The average has risen 1.3p per litre since yesterday. The average has risen 2.7p per litre since last week.
Prices last refreshed at 8:02pm on 30 July 2026, supplied through the official UK Government fuel price open data scheme and checked every 30 minutes.
Unleaded Prices
Unleaded (E10)
- Highest
- 161.9p/lapprox. £7.36/gal
- Average
- 155.9p/lapprox. £7.09/gal
- Lowest
- 149.9p/lapprox. £6.81/gal
Diesel Prices
Diesel (B7)
- Highest
- 181.9p/lapprox. £8.27/gal
- Average
- 175.2p/lapprox. £7.96/gal
- Lowest
- 167.9p/lapprox. £7.63/gal
Premium Unleaded Prices
Premium Unleaded (E5)
- Highest
- 185.9p/lapprox. £8.45/gal
- Average
- 173.4p/lapprox. £7.88/gal
- Lowest
- 160.9p/lapprox. £7.31/gal
Super Diesel Prices
Super Diesel (SDV)
- Highest
- 199.9p/lapprox. £9.09/gal
- Average
- 199.9p/lapprox. £9.09/gal
- Lowest
- 199.9p/lapprox. £9.09/gal
All forecourts in Porthmadog
149.9p/L
approx. £6.81/gal
Diesel B7
167.9p
approx. £7.63/gal
Premium E5
160.9p
approx. £7.31/gal
155.9p/L
approx. £7.09/gal
Diesel B7
175.9p
approx. £8.00/gal
SHELL
HIGH STREET, PORTHMADOG, GWYNEDD · LL49 9LU
Usually cheapest 2pm to 7pm, priciest 11pm to midnight here
Directions161.9p/L
approx. £7.36/gal
Diesel B7
181.9p
approx. £8.27/gal
Premium E5
185.9p
approx. £8.45/gal
Super Diesel
199.9p
approx. £9.09/gal
Search near Porthmadog
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Answers come straight from recorded official price data, refreshed every 30 minutes.
Cheapest reported unleaded
TESCO
TESCO STORES LTD, STRYD FAWR, PORTHMADOG
149.9p/L
Cheapest reported diesel
TESCO
TESCO STORES LTD, STRYD FAWR, PORTHMADOG
167.9p/L
By fuel grade in Porthmadog
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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 Porthmadog
- What is the average petrol price in Porthmadog?
- The average unleaded (E10) petrol price in Porthmadog is currently 155.9p per litre (approx. £7.09/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 175.2p per litre (approx. £7.96/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 149.9p per litre (approx. £6.81/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, SHELL (LL49 9LU) currently has the highest reported unleaded (E10) price in Porthmadog at 161.9p per litre (approx. £7.36/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.