Amid the cost-of-living crisis, we're all trying to save money wherever we can. Many people are visiting two or three different supermarkets so they can get the best prices for food and drink, staying in more and going out less, and limiting how long they put the heating on for. Plus, as people get started on their Christmas shopping, some people are abandoning their online shopping baskets in the hope they'll be sent a discount - and if you're not doing that yet, Martin Lewis says it's worth a go!

Whilst these are all effective ways of saving money on the shopping, saving money on petrol can be much more difficult. Short of driving all around town to find the best petrol price - and wasting petrol en-route - it can be tough to know whether the petrol you're buying is good value, or whether you're being over-charged.

Fortunately, the UK government set up a group in September that's responsible for monitoring road fuel prices. The Competition and Markets Authority investigates and records fuel prices and reports any sign of malpractice to the government. The Authority aims to help customers across the UK get a fair choice of prices when they buy fuel and forces retailers, including supermarkets, to share the prices they are charging customers on their forecourts.

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On average, UK drivers are currently paying 151p per litre of petrol, while people who own diesel vehicles are forking out 159p per litre. Nationally, prices have fallen since they reached an all-time high in July, 2022, of 191.55p for petrol and 199.22 for diesel, but have been heading upwards again in recent weeks. Currently, the cheapest place to buy petrol in the UK is at a Sainsbury's garage in Causeway Coast and Glens in Northern Ireland, where a litre of standard petrol is 138.9p.

WalesOnline has been able to access the latest data for standard grade petrol (E10) and standard grade diesel (B7) prices across Wales. Scroll down for the current cheapest place to buy petrol in every one of Wales' local authority areas, as of Friday morning. And for the latest Welsh news delivered to your inbox sign up to our newsletter

The location is followed by the cheapest prices for petrol and diesel in that area.

Blaenau Gwent

Petrol: Tesco garage on Castle Street in Abertillery, Ebbw Vale North. - 147.9p per litre.

Diesel: Tesco store at North West Approach in Glynebwy (Ebbw Vale) - 157.9p.

Bridgend

Petrol: Sainsbury's garage at the Welsh Designer Outlet Village (McArthur Glen) - 144.9p.

Diesel: Applegreen garage at Tremains Service Station in Rock Ferry - 155.8p.

Caerphilly

Petrol: Tesco garage at Pontymister Industrial Estate in Risca. - 146.9p.

Diesel: Tesco store at New Road Ystrad Mynach - 157.9p.

Carmarthenshire

Petrol: Tesco garage at Trostre Retail Park Llanelli, Llwynhendy - 145.9p.

Diesel: The Tesco garage at Trostre Retail Park Llanelli, Llwynhendy - 153.9p.

Ceredigion

Petrol: Tesco garage in Aberstwyth Road, Llanbadarn Fawr - 144.9p.

Diesel: Tesco garage in Aberstwyth Road, Llanbadarn Fawr - 154.9p.

Conwy

Petrol: Tesco garage at G Road, Llandudno Junction, Betws-y-Coed and Trefriw - 149,9p.

Diesel: Tesco garage at G Road, Llandudno Junction, Betws-y-Coed and Trefriw - 157.9p.

Denbighshire

Petrol: Tesco garage in Prestatyn Shopping Park in Rhuddlan - 149.9p.

Diesel: The Tesco garage at Prestatyn Shopping Park - 157.9p.

Flintshire

Petrol: Applegreen garage in King Street, Ruthin - 149.8p.

Diesel: Applegreen garage in King Street - 157.8p.

Gwynedd

Petrol: Tesco garage in Stryd Fawr, Porthmadog, Dewi - 143.9p.

Diesel: Tesco at Caernarfon Road in Bangor - 153.9p.

Isle of Anglesey

Petrol: Tesco at Penrhos Industrial Estate in Penrhos - 149.9p.

Diesel: Tesco at Penrhos Industrial Estate in Penrhos - 155.9p.

Merthyr Tydfil

Petrol: Asda at Dowlais Top, Merthyr Tydfil - 155.7p.

Diesel: Asda at Dowlais Top, Merthyr Tydfil - 162.7p.

Monmouthshire

Petrol: BP garage on Brecon Road, Magor West - 148.9p.

Diesel: Texaco at Rakestrow, Chepstow - 156.9p.

Neath Port Talbot

Petrol: Tesco at the service station at Prior Street in Port Talbot - 143.9p.

Diesel: Tesco on Neath Abbey Road in Neath Abbey- 153.9p.

Newport

Petrol: Tesco garage at Harlech Retail Park on Cardiff Road in Lliswerry - 145.9p.

Diesel: Shell at Malpas Road in Shaftesbury, at a cost of 153.9p.

Pembrokeshire

Petrol: Tesco garage at Havens Head Business Park in Milford Haven - 145.9p.

Diesel: Texaco at St Mary North - 154.9p.

Powys

Petrol: Texaco garage in Ridgebourne, Llanelwedd - 149.7p.

Diesel: Tesco on Wind Road in Ystradgynlais - 155.9p.

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Rhondda Cynon Taf

Petrol: Tesco garage at Gelli-Hirion Industrial Estate in Pontypridd - 146.9p.

Diesel: Tesco garage at Gelli-Hirion Industrial Estate in Pontypridd - 153.9p.

Swansea

Petrol: The Tesco garage at Tidal Reach, Pontarddulais - 145.9p.

Diesel: Applegreen in Sandfields East - 152.8p.

Torfaen

Petrol: The Tesco garage on Lower Bridge Street, Pontypool - 143.9p.

Diesel: The Tesco garage on Lower Bridge Street, Pontypool - 156.9p.

Vale of Glamorgan

Petrol: Tesco garage at Culverhouse Cross, Cardiff - 149.9p.

Diesel: Tesco garage at Culverhouse Cross, Cardiff - 156.9p.

Wrexham

Petrol: Tesco garage on Crescent Road in Brynyffynnon, Wrexham - 147.9p.

Diesel: Asda at Holt Road, Holywell West - 151.7p.