Fuel Price Check Analysis – Week of April 28, 2026 Petrol (E10) 155p 0.8% (-1.3p) 7d avg: 155.8p Prices dipping | Super Unleaded (E5) 172.6p 1.1% (-1.9p) 7d avg: 173.5p Prices dipping | Diesel (B7) 177.3p 1.6% (-2.9p) 7d avg: 179p Good time to fill up | Super Diesel (SDV) 196.6p 1.8% (-3.7p) 7d avg: 198.6p Good time to fill up |
Fuel Price Check Analysis – Week of April 28, 2026 Petrol (E10) 155p 0.8% (-1.3p) 7d avg: 155.8p Prices dipping | Super Unleaded (E5) 172.6p 1.1% (-1.9p) 7d avg: 173.5p Prices dipping | Diesel (B7) 177.3p 1.6% (-2.9p) 7d avg: 179p Good time to fill up | Super Diesel (SDV) 196.6p 1.8% (-3.7p) 7d avg: 198.6p Good time to fill up |

Today’s Cheapest Petrol and Diesel in St Mary's: The Full Report

A comprehensive breakdown of fuel prices in the St Mary's 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, 19th June 2026 at 14:55
1
Local Stations
23
Brands (TR Area)
0.0p
Max Price Gap
#68
UK Ranking REGION
Key Takeaways
  • Cheapest petrol: 198p at Island Carriers
  • Potential savings: Up to £0.00 per tank
  • 49 stations tracked across 23 brands
  • Prices have decreased 3p this week

Motorists in St Mary's are currently paying above-average prices compared to other UK regions. Over the past week, E10 petrol prices in TR have Decreased 3p (1.9%)

According to our latest data feed from the Competition and Markets Authority (CMA), selecting the right forecourt in St Mary's could save you up to 0.0p per litre. For an average 55-litre family car, that's a saving of over £0.00 on a single tank.

Market Competition: Moderate competition

Competition Level: High

St Mary's has 49 active fuel stations across 23 different brands, with a brand diversity index of 0.47 - indicating healthy market competition.

The price spread between cheapest and average stations is 21.1p, revealing significant price differences - shop around to save!

Today's Best Value

Cheapest E10 Petrol in Isles of Scilly, St Mary's:
198p at Island Carriers, Porthmellon Industrial Estate, St Mary's, Isles of Scilly

Cheapest B7 Diesel in Isles of Scilly, St Mary's:
205p at Island Carriers, Porthmellon Industrial Estate, St Mary's, Isles of Scilly

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

Fuel Type Availability

E10
Unleaded (E10)
Widely available
47 / 49 Stations (95.9%)
E5
Super Unleaded (E5)
Moderate availability
33 / 49 Stations (67.3%)
B7
Diesel (B7)
Widely available
49 / 49 Stations (100%)
SDV
Premium Diesel
Moderate availability
19 / 49 Stations (38.8%)

Top 1 cheapest petrol stations (E10)

Here is the verified list of the most affordable places to buy standard Unleaded petrol in St Mary's today.

PETROL LEADERBOARD Live Data
1
Island Carriers
Porthmellon Industrial Estate, St Mary's, Isles of Scilly , TR21 0JY
198p
BEST PRICE

Top 1 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 St Mary's area.

DIESEL LEADERBOARD Live Data
1
Island Carriers
Porthmellon Industrial Estate, St Mary's, Isles of Scilly , TR21 0JY
205p
BEST PRICE

How to save on fuel in St Mary's

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 St Mary's.

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

"St Mary's benefits from strong market competition with 23 brands operating across 49 stations. The recent 3p price drop presents excellent buying opportunities, while with a 21.1p price gap between cheapest and average stations, careful selection could save £11.61 per tank."

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

Frequently Asked Questions

As of June 19, 2026, the cheapest station is Island Carriers at 198p per litre.

There is currently a 0.0p difference between the cheapest and most expensive stations in St Mary's. For a standard family car, this equals a saving of £0.00 per tank.

Not currently. An independent or oil-company brand (Island Carriers) 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: 15:02, 19 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 St Mary's was last synchronized at 14:55 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) 3p
Was: 159p → Now: 156p
Diesel (B7) 1p
Was: 178.5p → Now: 177.5p

Visualise the Savings

View 2 local stations on our interactive map.

Open Live Map
Popular Brands in St Mary's
Island Carriers