Fuel Price Check Analysis – Week of April 28, 2026 Petrol (E10) 167.5p 1.2% (+2p) 7d avg: 166.6p Slight rise | Super Unleaded (E5) 185.4p 0.8% (+1.5p) 7d avg: 184.6p Slight rise | Diesel (B7) 192.7p 1.7% (+3.2p) 7d avg: 191.2p Slight rise | Super Diesel (SDV) 213.4p 1.7% (+3.6p) 7d avg: 211.5p Hold off if you can |
Fuel Price Check Analysis – Week of April 28, 2026 Petrol (E10) 167.5p 1.2% (+2p) 7d avg: 166.6p Slight rise | Super Unleaded (E5) 185.4p 0.8% (+1.5p) 7d avg: 184.6p Slight rise | Diesel (B7) 192.7p 1.7% (+3.2p) 7d avg: 191.2p Slight rise | Super Diesel (SDV) 213.4p 1.7% (+3.6p) 7d avg: 211.5p Hold off if you can |

Today’s Cheapest Petrol and Diesel in Porthmadog, Borth-y-Gest, Morfa Bychan, Penmorfa, Prenteg, Tremadog: The Full Report

A comprehensive breakdown of fuel prices in the Porthmadog, Borth-y-Gest, Morfa Bychan, Penmorfa, Prenteg, Tremadog area. We analyze the market data to help you save on your next fill-up.

Jonathan Mathews
Jonathan Mathews
Automotive Data Analyst
10+ years automotive industry
Last Updated Friday, 18th September 2026 at 10:16
5
Local Stations
39
Brands (LL Area)
22.0p
Max Price Gap
#102
UK Ranking REGION
Key Takeaways
  • Cheapest petrol: 153.9p at TESCO
  • Potential savings: Up to £12.10 per tank
  • 108 stations tracked across 39 brands

Motorists in Porthmadog, Borth-y-Gest, Morfa Bychan, Penmorfa, Prenteg, Tremadog are currently paying above-average prices compared to other UK regions. Over the past week, E10 petrol prices in LL have Increased 1p (0.6%)

According to our latest data feed from the Competition and Markets Authority (CMA), selecting the right forecourt in Porthmadog, Borth-y-Gest, Morfa Bychan, Penmorfa, Prenteg, Tremadog could save you up to 22.0p per litre. For an average 55-litre family car, that's a saving of over £12.10 on a single tank.

Market Competition: Moderate competition

Competition Level: High

Porthmadog, Borth-y-Gest, Morfa Bychan, Penmorfa, Prenteg, Tremadog has 108 active fuel stations across 39 different brands, with a brand diversity index of 0.36 - indicating healthy market competition.

The price spread between cheapest and average stations is 28.1p, revealing significant price differences - shop around to save!

Today's Best Value

Cheapest E10 Petrol in Porthmadog, Porthmadog, Borth-y-Gest, Morfa Bychan, Penmorfa, Prenteg, Tremadog:
153.9p at TESCO, TESCO STORES LTD, STRYD FAWR, PORTHMADOG, WALES

Cheapest B7 Diesel in Porthmadog, Porthmadog, Borth-y-Gest, Morfa Bychan, Penmorfa, Prenteg, Tremadog:
180.9p at TESCO, TESCO STORES LTD, STRYD FAWR, PORTHMADOG, WALES

Surprisingly, an independent or branded station (TESCO) has beaten the supermarkets to the top spot today.

Fuel Type Availability

E10
Unleaded (E10)
Widely available
104 / 108 Stations (96.3%)
E5
Super Unleaded (E5)
Moderate availability
65 / 108 Stations (60.2%)
B7
Diesel (B7)
Widely available
105 / 108 Stations (97.2%)
SDV
Premium Diesel
Moderate availability
41 / 108 Stations (38%)

Top 5 cheapest petrol stations (E10)

Here is the verified list of the most affordable places to buy standard Unleaded petrol in Porthmadog, Borth-y-Gest, Morfa Bychan, Penmorfa, Prenteg, Tremadog today.

PETROL LEADERBOARD Live Data
1
TESCO
TESCO STORES LTD, STRYD FAWR, PORTHMADOG, WALES , LL49 9NU
153.9p
BEST PRICE
2
ESSAR
PENAMSER GARAGE, PENAMSER ROAD, PORTHMADOG, LL49 9NY , LL49 9NY
169.9p
+16.0p
3
Shell
MFG Porthmadog, High Street, Porthmadog , LL49 9NG
175.9p
+22.0p
4
SHELL
HIGH STREET, PORTHMADOG, GWYNEDD, WALES , LL49 9LU
175.9p
+22.0p
5
Glanaber Garage
GLANABER GARAGE, BORTH-Y-GEST, PORTHMADOG, LL49 9TP, PORTHMADOG, Wales , LL49 9TP
175.9p
+22.0p

Top 5 cheapest diesel stations (B7)

For diesel drivers, the price variance can often be even higher. The following stations are currently offering the best value for B7 Diesel in the Porthmadog, Borth-y-Gest, Morfa Bychan, Penmorfa, Prenteg, Tremadog area.

DIESEL LEADERBOARD Live Data
1
TESCO
TESCO STORES LTD, STRYD FAWR, PORTHMADOG, WALES , LL49 9NU
180.9p
BEST PRICE
2
ESSAR
PENAMSER GARAGE, PENAMSER ROAD, PORTHMADOG, LL49 9NY , LL49 9NY
194.9p
+14.0p
3
Shell
MFG Porthmadog, High Street, Porthmadog , LL49 9NG
199.9p
+19.0p
4
SHELL
HIGH STREET, PORTHMADOG, GWYNEDD, WALES , LL49 9LU
199.9p
+19.0p
5
Glanaber Garage
GLANABER GARAGE, BORTH-Y-GEST, PORTHMADOG, LL49 9TP, PORTHMADOG, Wales , LL49 9TP
199.9p
+19.0p

How to save on fuel in Porthmadog, Borth-y-Gest, Morfa Bychan, Penmorfa, Prenteg, Tremadog

While choosing the cheapest station is the easiest way to save, changing your driving habits can also make a significant difference to your monthly spend.

Drive Smoothly

Aggressive acceleration and heavy braking can increase fuel consumption by up to 40% in stop-and-go traffic around Porthmadog, Borth-y-Gest, Morfa Bychan, Penmorfa, Prenteg, Tremadog.

Reduce Weight

Carrying an extra 50kg in your boot increases fuel consumption by 1-2%. Clear out unnecessary items.

Market Analyst Commentary
CFP Research Team

"Porthmadog, Borth-y-Gest, Morfa Bychan, Penmorfa, Prenteg, Tremadog benefits from strong market competition with 39 brands operating across 108 stations. However, prices rank in the bottom 14% nationally, suggesting room for improvement, while with a 28.1p price gap between cheapest and average stations, careful selection could save £15.46 per tank."

For more detailed savings, explore our Interactive Fuel Map to scan the entire region visually.

Frequently Asked Questions

As of September 18, 2026, the cheapest station is TESCO at 153.9p per litre.

There is currently a 22.0p difference between the cheapest and most expensive stations in Porthmadog, Borth-y-Gest, Morfa Bychan, Penmorfa, Prenteg, Tremadog. For a standard family car, this equals a saving of £12.10 per tank.

Not currently. An independent or oil-company brand (TESCO) is actually cheaper than the local supermarkets today.

Our Analysis Methodology

Data Collection
  • Direct feed from UK Government CMA API
  • Updated every 30 minutes via automated polling
  • Zero user-submitted prices (prevents manipulation)
  • Last sync: 10:48, 18 Sep 2026
Quality Assurance
  • Automated anomaly detection for pricing errors
  • Cross-referenced against regional averages
  • Outliers flagged for manual review
  • Historical data tracked for trend validation
Verified Data Source: All prices displayed on this page are sourced directly from the Competition and Markets Authority's official fuel price transparency scheme. We do not accept payments from retailers to alter rankings or display preferential pricing.
Data Accuracy & Methodology

Source: We retrieve real-time pricing data directly from the UK Government CMA Open Data Scheme.

Frequency: Data for Porthmadog, Borth-y-Gest, Morfa Bychan, Penmorfa, Prenteg, Tremadog was last synchronized at 10:16 today. We update our database every 4 hours to ensure accuracy.

Disclaimer: While we strive for 100% accuracy, forecourt prices can change instantly. The prices listed above were correct at the time of our last server sync.

Editorial Policy

CheckFuelPrices is independent. We do not accept payment from fuel brands to alter rankings. Read our full policy.

📈 7-Day Price Movement
Petrol (E10) 1p
Was: 168.9p → Now: 169.9p
Diesel (B7) 3.4p
Was: 190.4p → Now: 193.8p

Visualise the Savings

View 10 local stations on our interactive map.

Open Live Map
Popular Brands in Porthmadog, Borth-y-Gest, Morfa Bychan, Penmorfa, Prenteg, Tremadog
TESCO ESSAR Shell SHELL Glanaber Garage