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Petrol and diesel prices in Gwynedd

Average pump prices across 36 filling stations in Gwynedd, from the prices every UK forecourt must now publish under the government’s Fuel Finder scheme. Checked 16 Sept, 16:47.

Last updated
Records analysed
8,070 filling stations
Methodology
View methodology
  • Average unleaded petrol 171.4p 0.3p below the UK average
  • Average diesel 195.3p 0.7p above the UK average
  • Cheapest petrol 166.9p Texaco Caer Service Station
  • Filling stations 36 3 at supermarkets

Unleaded petrol averages 171.4p a litre across 32 forecourts in Gwynedd, 0.3p below the UK average. Diesel averages 195.3p, 0.7p above the UK average. The cheapest petrol is at Texaco Caer Service Station, 166.9p; the dearest is 178.9p. The cheapest diesel is at Essar London Garage Service Station, 188.9p.

Cheapest petrol and diesel in Gwynedd

Unleaded petrol (E10)
Filling station Price
Texaco Caer Service Station Caernarfon 166.9p
Murco Clynnog Service Station Caernarfon 166.9p
Texaco Bryn Llwyd Services Bangor 167.9p
Essar London Garage Service Station Caernarfon 167.9p
MFG Morrisons Caernarfon Caernarfon 168.9p
Essar Prysor Service Station Ltd Blaenau Ffestiniog 168.9p
Spar Br Tywyn Tywyn 169.9p
Esso Cwt Gwyn Cyf Dolgellau 169.9p
Texaco Dolydd Caernarfon 169.9p
Shell Gwalia Garage Caernarfon Limited Caernarfon 169.9p
Diesel (B7)
Filling station Price
Essar London Garage Service Station Caernarfon 188.9p
Spar Parciau Criccieth 189.9p
Tesco Porthmadog Superstore Porthmadog 189.9p
Texaco Caer Service Station Caernarfon 191.9p
Murco Clynnog Service Station Caernarfon 191.9p
Essar Llanbedrog Service Station Pwllheli 191.9p
Valero Siop Pitstop Pwllheli 191.9p
W & G Williams Pwllheli 191.9p
Texaco Bryn Llwyd Services Bangor 192.9p
MFG Morrisons Caernarfon Caernarfon 192.9p

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Supermarkets against other forecourts

Supermarket petrol is 0.7p a litre cheaper on average than at other forecourts in Gwynedd.

Average prices by type of forecourt in Gwynedd
Forecourts Petrol Diesel Stations
Supermarkets 170.8p 194.2p 3
Other forecourts 171.5p 195.4p 29

Council areas in Wales, cheapest first

Gwynedd is number 15 of 22 for petrol.

Council areas in Wales: average fuel prices
Area Petrol Diesel Stations
Pembrokeshire 168.0p 191.5p 32
Torfaen 168.7p 191.0p 9
Caerphilly 168.8p 191.7p 23
Ceredigion 169.3p 193.7p 25
Neath Port Talbot 169.3p 192.7p 18
Vale of Glamorgan 169.4p 193.9p 11
Carmarthenshire 169.5p 192.3p 43
Bridgend 169.8p 193.1p 18
Rhondda Cynon Taf 170.1p 193.2p 26
Isle of Anglesey 170.2p 194.7p 16
Blaenau Gwent 170.2p 191.4p 9
Powys 170.9p 194.9p 49
Wrexham 171.3p 193.0p 18
Cardiff 171.3p 194.3p 31
Gwynedd 171.4p 195.3p 36
Newport 171.4p 194.4p 17
Swansea 172.6p 195.1p 29
Merthyr Tydfil 173.7p 198.5p 5
Monmouthshire 173.8p 196.3p 18
Flintshire 174.3p 195.1p 31
Denbighshire 174.6p 195.4p 17
Conwy 175.4p 196.7p 17

Every filling station in Gwynedd

Every filling station in Gwynedd and its prices
Filling station Petrol Diesel Updated
Texaco Caer Service Station Caernarfon 166.9p 191.9p 15 Sept, 07:58
Murco Clynnog Service Station Caernarfon 166.9p 191.9p 15 Sept, 22:28
Texaco Bryn Llwyd Services Bangor 167.9p 192.9p 16 Sept, 11:40
Essar London Garage Service Station Caernarfon 167.9p 188.9p 10 Sept, 10:27
MFG Morrisons Caernarfon Caernarfon · supermarket 168.9p 192.9p 15 Sept, 22:33
Essar Prysor Service Station Ltd Blaenau Ffestiniog 168.9p 197.9p 14 Sept, 11:59
Spar Br Tywyn Tywyn 169.9p 196.9p 14 Sept, 15:44
Esso Cwt Gwyn Cyf Dolgellau 169.9p 197.9p 16 Sept, 11:27
Texaco Dolydd Caernarfon 169.9p 193.9p 16 Sept, 09:33
Shell Gwalia Garage Caernarfon Limited Caernarfon 169.9p 194.9p 16 Sept, 10:20
Essar Llanbedrog Service Station Pwllheli 169.9p 191.9p 11 Sept, 10:52
Essar Madog Garage / Hamdden Caravans Ltd LL49 169.9p 194.9p 16 Sept, 07:17
Mallwyd Service Station Machynlleth 169.9p 195.9p 15 Sept, 09:13
Spar Parciau Criccieth 169.9p 189.9p 11 Sept, 11:41
Tesco Porthmadog Superstore Porthmadog 169.9p 189.9p 14 Sept, 17:05
Valero Siop Pitstop Pwllheli 169.9p 191.9p 11 Sept, 11:52
W & G Williams Pwllheli 169.9p 191.9p 7 Sept, 15:38
Texaco H.g.thomas Motors Limited Corwen 170.9p – 15 Sept, 11:21
Asda Bangor Farrar Road Supermarket Bangor · supermarket 171.7p 194.7p 15 Sept, 13:39
Tesco Bangor Extra Bangor · supermarket 171.9p 194.9p 14 Sept, 17:08
Texaco Beran Caernarfon 171.9p 194.9p 16 Sept, 12:10
Texaco Barmouth Road Service Station Dyffryn Ardudwy 172.9p 196.9p 15 Sept, 09:29
BP Garth Services Bangor 172.9p 196.9p 15 Sept, 20:22
Glanaber Garage Porthmadog 172.9p 196.9p 15 Sept, 11:24
Essar A.d.jones & Co Y Bala 173.9p 198.9p 15 Sept, 17:14
Moduron Y Bala Ltd Bala 173.9p 199.9p 11 Sept, 07:59
Shell MFG Porthmadog Porthmadog 174.9p 197.9p 15 Sept, 22:36
Esso O H Griffith & Co Pwllheli 174.9p 196.9p 10 Sept, 06:36
Esso Pulrose Motor Services Ltd Pwllheli 174.9p 196.9p 10 Sept, 09:33
Esso Allan Green Penrhyndeudraeth 175.9p 199.9p 10 Sept, 10:28
Esso Asda Bangor Express Petrol Bangor 175.9p 199.9p 16 Sept, 16:21
Essar Morfa Garage Harlech 178.9p 202.9p 16 Sept, 09:37
Bradburys Garage Abermo – – –
Cambrian Garage Blaenau Ffestiniog – – 27 Aug, 10:14
BP Glandon Spar Express Pwllheli – – 26 Aug, 11:30
Texaco Spar Express Dolgellau Dolgellau – – 26 Aug, 11:30

A dash means no current price: none reported, not changed for over two weeks, or not believable.

Data sources and methodology

Datasets used on this page
Figures Source Period Records Updated
Forecourt prices Fuel Finder open data Fuel Finder statutory scheme
ONS Postcode Directory Office for National Statistics 		Prices at 16:47 on 16 September 2026 8,070 filling stations 16 September 2026
  • Averages use unleaded (E10) and standard diesel (B7) prices at open forecourts, leaving out prices unchanged for over two weeks or far from every other forecourt. They count each forecourt once, not by how much fuel it sells.
  • Forecourts are placed in council areas from their postcode, using the ONS Postcode Directory.
How we calculate these figures All data sources

Source: Fuel Finder, the UK government’s statutory fuel price scheme.

Source: Office for National Statistics licensed under the Open Government Licence v3.0. Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026.