Live prices
Cheapest petrol and diesel prices in Casnewydd
5 forecourts tracked in Casnewydd (5 reporting unleaded (E10), 5 reporting diesel (B7), 3 reporting premium (E5), 1 reporting super diesel). Prices last refreshed at 1:31am on 19 September 2026.
The cheapest reported unleaded petrol (E10) in Casnewydd is £7.63 a gallon (167.9p per litre) at Tesco, Unit 6 Harlech Retail Park, Cardiff Road, Casnewydd. The average across 5 forecourts currently reporting this grade is £7.81 a gallon (171.9p 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 0.6p per litre below the UK average of 172.5p.
The average has risen 0.2p per litre since yesterday. The average has risen 1.8p per litre since last week.
Prices last refreshed at 1:31am on 19 September 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 Casnewydd is the highest we have recorded here in 4 weeks. The Casnewydd average has risen 1.8p a litre over the past week.
Unleaded Prices
Unleaded (E10)
- Highest
- £8.00/gal175.9p/L
- Average
- £7.81/gal171.9p/L
- Lowest
- £7.77/gal170.9p/L
Diesel Prices
Diesel (B7)
- Highest
- £8.95/gal196.9p/L
- Average
- £8.88/gal195.3p/L
- Lowest
- £8.91/gal195.9p/L
Premium Unleaded Prices
Premium Unleaded (E5)
- Highest
- £9.09/gal199.9p/L
- Average
- £8.54/gal187.9p/L
- Lowest
- £8.09/gal177.9p/L
Super Diesel Prices
Super Diesel (SDV)
- Highest
- £9.54/gal209.9p/L
- Average
- £9.54/gal209.9p/L
- Lowest
- £9.54/gal209.9p/L
All forecourts in Casnewydd
5 forecourts in Casnewydd, with live prices and full addresses. Showing 1 to 5.
Unit 6 Harlech Retail Park, Cardiff Road, Casnewydd · NP20 3BA
Usually cheapest midnight to 5am, priciest 6pm to 11pm here
DirectionsDiesel B7
Premium E5
Hillcroft Garage, Chepstow Road, Langstone, Casnewydd · NP18 2JN
Usually cheapest midnight to 5am, priciest 9am to 2pm here
DirectionsDiesel B7
Chepstow RD, Casnewydd · NP19 9EZ
Usually cheapest midnight to 5am, priciest 4pm to 9pm here
DirectionsDiesel B7
Premium E5
Super Diesel
Spar Stores, Ponthir Road, Caerleon, Casnewydd · NP18 3NY
Usually cheapest midnight to 5am, priciest 3pm to 8pm here
DirectionsDiesel B7
Sinclair Garages, Corporation Road, Casnewydd, NP19 0HE, Casnewydd · NP19 0HE
Usually cheapest midnight to 5am, priciest 4pm to 9pm here
DirectionsDiesel B7
Premium E5
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Answers come straight from recorded official price data, refreshed every 30 minutes.
Cheapest reported unleaded
Tesco
Unit 6 Harlech Retail Park, Cardiff Road, Casnewydd
167.9p/L
Cheapest reported diesel
Tesco
Unit 6 Harlech Retail Park, Cardiff Road, Casnewydd
190.9p/L
By fuel grade in Casnewydd
Nearby areas
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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 Casnewydd
- What is the average petrol price in Casnewydd?
- The average unleaded (E10) petrol price in Casnewydd is currently 171.9p per litre (approx. £7.81/gal), based on live data from 5 forecourts reporting this grade. Prices are updated every 30 minutes from official UK government data.
- What is the average diesel price in Casnewydd?
- The average diesel (B7) price in Casnewydd is currently 195.3p per litre (approx. £8.88/gal). This is based on live data from forecourts in the area, updated every 30 minutes.
- Which is the cheapest petrol station in Casnewydd?
- Tesco at Unit 6 Harlech Retail Park, Cardiff Road, Casnewydd currently has the cheapest reported unleaded petrol in Casnewydd 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 Casnewydd?
- According to official UK government fuel price data, Esso Sinclair Garages (NP19 0HE) currently has the highest reported unleaded (E10) price in Casnewydd 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 Casnewydd?
- 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.