Today’s Cheapest Petrol and Diesel in Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons: The Full Report

A comprehensive breakdown of fuel prices in the Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons 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 Saturday, 7th February 2026 at 04:50
6
Local Stations
24
Brands (CF Area)
6.0p
Max Price Gap
#30
UK Ranking REGION
Key Takeaways
  • Cheapest petrol: 129.9p at Asda
  • Potential savings: Up to £3.30 per tank
  • 87 stations tracked across 24 brands

Motorists in Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons are currently enjoying some of the lowest fuel prices in the UK, ranking in the top 25% nationally. Over the past week, E10 petrol prices in CF have Increased 0.9p (0.7%)

According to our latest data feed from the Competition and Markets Authority (CMA), selecting the right forecourt in Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons could save you up to 6.0p per litre. For an average 55-litre family car, that's a saving of over £3.30 on a single tank.

Market Competition: Moderate competition

Competition Level: High

Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons has 87 active fuel stations across 24 different brands, with a brand diversity index of 0.28 - indicating healthy market competition.

The price spread between cheapest and average stations is 6.3p, revealing significant price differences - shop around to save!

Today's Best Value

Cheapest E10 Petrol in Cardiff, Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons:
129.9p at Asda, 8 Dering Road, Pontprennau, Cardiff

Cheapest B7 Diesel in Cardiff, Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons:
135.9p at Asda, 8 Dering Road, Pontprennau, Cardiff

As expected, the supermarket chains are leading the price war in Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons, aggressively undercutting the major oil brands.

Fuel Type Availability

E10
Unleaded (E10)
Widely available
82 / 87 Stations (94.3%)
E5
Super Unleaded (E5)
Moderate availability
58 / 87 Stations (66.7%)
B7
Diesel (B7)
Widely available
80 / 87 Stations (92%)
SDV
Premium Diesel
Moderate availability
35 / 87 Stations (40.2%)

Top 6 cheapest petrol stations (E10)

Here is the verified list of the most affordable places to buy standard Unleaded petrol in Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons today.

PETROL LEADERBOARD Live Data
1
Asda
8 Dering Road, Pontprennau, Cardiff , CF23 8NL
129.9p
BEST PRICE
2
Morrisons
MFG Morrisons Cardiff Newport Road, Ipswich Road, CARDIFF , CF23 9YG
130.9p
+1.0p
3
Sainsbury's
Colchester Avenue, Penylan , CF23 9XN
131.9p
+2.0p
4
Texaco
MFG Cardinal, Newport Road, Cardiff , CF23 9AD
132.9p
+3.0p
5
Esso
MFG Premier, Newport Road, Cardiff , CF23 9AE
132.9p
+3.0p
6
Pentwyn Service Station
PENTWYN SERVICE STATION, PENTWYN ROAD, PENTWYN, CARDIFF, CF23 7XH, CARDIFF, Wales , CF23 7XH
135.9p
+6.0p

Top 6 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 Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons area.

DIESEL LEADERBOARD Live Data
1
Asda
8 Dering Road, Pontprennau, Cardiff , CF23 8NL
135.9p
BEST PRICE
2
Morrisons
MFG Morrisons Cardiff Newport Road, Ipswich Road, CARDIFF , CF23 9YG
136.9p
+1.0p
3
Sainsbury's
Colchester Avenue, Penylan , CF23 9XN
137.9p
+2.0p
4
Texaco
MFG Cardinal, Newport Road, Cardiff , CF23 9AD
139.9p
+4.0p
5
Esso
MFG Premier, Newport Road, Cardiff , CF23 9AE
139.9p
+4.0p
6
Pentwyn Service Station
PENTWYN SERVICE STATION, PENTWYN ROAD, PENTWYN, CARDIFF, CF23 7XH, CARDIFF, Wales , CF23 7XH
141.9p
+6.0p

How to save on fuel in Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons

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 Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons.

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

"Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons benefits from strong market competition with 24 brands operating across 87 stations. Ranking in the top 25% nationally makes this an excellent area for fuel savings, while with a 6.3p price gap between cheapest and average stations, careful selection could save £3.47 per tank."

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

Frequently Asked Questions

As of February 7, 2026, the cheapest station is Asda at 129.9p per litre.

There is currently a 6.0p difference between the cheapest and most expensive stations in Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons. For a standard family car, this equals a saving of £3.30 per tank.

Yes, currently supermarkets (Asda) are offering the lowest prices in the area.

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: 05:09, 07 Feb 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 Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons was last synchronized at 04:50 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) 0.9p
Was: 130.3p → Now: 131.2p
Diesel (B7) Stable
Was: 138p → Now: 138.4p

Visualise the Savings

View 12 local stations on our interactive map.

Open Live Map
Popular Brands in Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons
Asda Morrisons Sainsbury's Texaco Esso