Fuel Price Check Analysis – Week of April 28, 2026 Petrol (E10) 155.4p 0.6% (-1p) 7d avg: 156p Prices dipping | Super Unleaded (E5) 173p 0.9% (-1.6p) 7d avg: 173.8p Prices dipping | Diesel (B7) 178.2p 1.2% (-2.2p) 7d avg: 179.4p Prices dipping | Super Diesel (SDV) 197.7p 1.4% (-2.8p) 7d avg: 199.2p Good time to fill up |
Fuel Price Check Analysis – Week of April 28, 2026 Petrol (E10) 155.4p 0.6% (-1p) 7d avg: 156p Prices dipping | Super Unleaded (E5) 173p 0.9% (-1.6p) 7d avg: 173.8p Prices dipping | Diesel (B7) 178.2p 1.2% (-2.2p) 7d avg: 179.4p Prices dipping | Super Diesel (SDV) 197.7p 1.4% (-2.8p) 7d avg: 199.2p Good time to fill up |

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 Thursday, 18th June 2026 at 22:15
7
Local Stations
23
Brands (CF Area)
5.0p
Max Price Gap
#16
UK Ranking REGION
Key Takeaways
  • Cheapest petrol: 151.9p at MORRISONS
  • Potential savings: Up to £2.75 per tank
  • 102 stations tracked across 23 brands
  • Prices have decreased 0.8p this week

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 14% nationally. Over the past week, E10 petrol prices in CF have Decreased 0.8p (0.5%)

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 5.0p per litre. For an average 55-litre family car, that's a saving of over £2.75 on a single tank.

Market Competition: Moderate competition

Competition Level: High

Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons has 102 active fuel stations across 23 different brands, with a brand diversity index of 0.23 - indicating healthy market competition.

The price spread between cheapest and average stations is 7.7p, 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:
151.9p at MORRISONS, IPSWICH ROAD, PEN-Y-LAN, CARDIFF, WALES

Cheapest B7 Diesel in Cardiff, Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons:
167.9p at MORRISONS, IPSWICH ROAD, PEN-Y-LAN, CARDIFF, WALES

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

Fuel Type Availability

E10
Unleaded (E10)
Widely available
101 / 102 Stations (99%)
E5
Super Unleaded (E5)
Moderate availability
70 / 102 Stations (68.6%)
B7
Diesel (B7)
Widely available
101 / 102 Stations (99%)
SDV
Premium Diesel
Moderate availability
45 / 102 Stations (44.1%)

Top 7 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
MORRISONS
IPSWICH ROAD, PEN-Y-LAN, CARDIFF, WALES , CF23 9YG
151.9p
BEST PRICE
2
SAINSBURY'S
COLCHESTER AVENUE, PENYLAN, CARDIFF, WALES , CF23 9XN
152.9p
+1.0p
3
TEXACO
NEWPORT ROAD, CARDIFF, SOUTH GLAMORGAN, WALES , CF23 9AD
153.9p
+2.0p
4
ESSO
NEWPORT ROAD, CARDIFF, SOUTH GLAMORGAN, WALES , CF23 9AE
153.9p
+2.0p
5
ASDA
8 DERING ROAD, PONTPRENNAU, CARDIFF, WALES , CF23 8NL
156.9p
+5.0p
6
Texaco
PENTWYN SERVICE STATION, PENTWYN ROAD, PENTWYN, CARDIFF, Wales , CF23 7XH
156.9p
+5.0p
7
WELCOME BREAK
MOTORWAY SERVICES, CARDIFF GATE, CARDIFF, WALES , CF23 8RA
156.9p
+5.0p

Top 7 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
MORRISONS
IPSWICH ROAD, PEN-Y-LAN, CARDIFF, WALES , CF23 9YG
167.9p
BEST PRICE
2
TEXACO
NEWPORT ROAD, CARDIFF, SOUTH GLAMORGAN, WALES , CF23 9AD
169.9p
+2.0p
3
ESSO
NEWPORT ROAD, CARDIFF, SOUTH GLAMORGAN, WALES , CF23 9AE
169.9p
+2.0p
4
SAINSBURY'S
COLCHESTER AVENUE, PENYLAN, CARDIFF, WALES , CF23 9XN
172.9p
+5.0p
5
Texaco
PENTWYN SERVICE STATION, PENTWYN ROAD, PENTWYN, CARDIFF, Wales , CF23 7XH
177.9p
+10.0p
6
ASDA
8 DERING ROAD, PONTPRENNAU, CARDIFF, WALES , CF23 8NL
179.9p
+12.0p
7
WELCOME BREAK
MOTORWAY SERVICES, CARDIFF GATE, CARDIFF, WALES , CF23 8RA
184.9p
+17.0p

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 23 brands operating across 102 stations. Ranking in the top 14% nationally makes this an excellent area for fuel savings, while with a 7.7p price gap between cheapest and average stations, careful selection could save £4.24 per tank."

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

Frequently Asked Questions

As of June 18, 2026, the cheapest station is MORRISONS at 151.9p per litre.

There is currently a 5.0p 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 £2.75 per tank.

Not currently. An independent or oil-company brand (MORRISONS) 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: 22:17, 18 Jun 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 22:15 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) 0.8p
Was: 154.4p → Now: 153.6p
Diesel (B7) 1.1p
Was: 176.1p → Now: 177.2p

Visualise the Savings

View 14 local stations on our interactive map.

Open Live Map
Popular Brands in Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons
MORRISONS SAINSBURY'S TEXACO ESSO ASDA