UK Fuel Price Update: Petrol and Diesel Prices Continue to Rise
UK fuel prices for 17 September 2026: E10 petrol and diesel continue to rise. See today's average prices, weekly changes and fill-up costs.
17 September 2026 — Fuel prices across the UK continue to move higher this week. Petrol and diesel have both increased over the past seven days, with diesel seeing the stronger rise. Here is the latest snapshot of prices at UK forecourts today.
UK fuel prices continue to climb
The upward trend in UK fuel prices is continuing.
The average price of E10 petrol is now around 171.9 pence per litre, while diesel has reached approximately 194.9p per litre.
Over the past seven days, petrol has increased by around 3.3p per litre, while diesel has risen by approximately 4.8p per litre.
For drivers, the difference is becoming increasingly noticeable when filling up, particularly for those covering high mileages every week.
Average UK fuel prices today
The latest available UK station data for Thursday 17 September 2026 shows:
| Fuel | Average price |
| E10 Petrol | 171.9p/L |
| Diesel | 194.9p/L |
Prices can vary considerably between individual forecourts, regions and retailers, so the national average should be viewed as an indication of the wider market rather than the price every driver will pay.
Diesel is seeing the strongest increase
Diesel is currently under particular pressure.
At around 194.9p per litre, the average diesel price has increased by approximately 4.8p over the past week.
That means a 50-litre diesel fill-up now costs approximately: £97.45
Compared with a week earlier, the increase is around £2.40 for a 50-litre tank.
For drivers who regularly cover long distances, these increases can quickly add up over the course of a month.
Petrol prices are rising too
Petrol has also continued to increase.
The current UK average for E10 petrol is approximately 171.9p per litre, around 3.3p more than a week ago.
A 50-litre petrol fill-up therefore costs approximately: £85.95
The difference between petrol and diesel remains significant, with diesel currently costing around 23p more per litre.
For a 50-litre tank, that represents a difference of approximately £11.50.
How much does a fill-up cost today?
Looking at a standard 50-litre tank gives a more practical picture of current fuel prices:
| Fuel | Average price | 50-litre fill-up |
| E10 Petrol | 171.9p/L | £85.95 |
| Diesel | 194.9p/L | £97.45 |
The actual cost will depend on the station selected and the vehicle's tank capacity.
Fuel prices vary significantly between forecourts
The national average does not tell the whole story.
Drivers can find substantial differences between nearby stations, depending on the retailer, location and level of local competition.
Current UK data also shows a noticeable difference between supermarket forecourts and major oil brands.
For drivers willing to compare prices before filling up, even a difference of 5p per litre represents £2.50 on a 50-litre tank.
A difference of 10p per litre would mean a £5 saving.
This is why checking local fuel prices before filling up can make a meaningful difference, particularly when prices are rising.
Why are UK fuel prices increasing?
Several factors influence the price motorists see at the pump.
The main elements include:
- the price of crude oil;
- wholesale petrol and diesel prices;
- refining costs;
- supply and demand;
- exchange rates;
- transport and distribution costs;
- fuel duty and taxation;
- retailer pricing.
International oil markets remain particularly important at the moment.
Oil prices have remained above $100 per barrel despite some easing in prices today, while disruptions to supply and tighter diesel markets continue to influence wholesale fuel costs.
The impact of these international movements is not always immediate at UK forecourts. Wholesale prices, refining and distribution costs can take time to feed through to retail prices.
Fuel prices are also affecting inflation
The recent increase in petrol and diesel prices is already visible in the UK's inflation data.
UK inflation reached 3.1% in August 2026, with higher motor fuel prices contributing to the increase.
Official statistics showed that average petrol prices increased significantly between July and August, while diesel prices also recorded a substantial monthly increase.
Fuel costs therefore remain an important factor to watch, not only for motorists but also for household budgets and transport-intensive businesses.
What should UK drivers watch next?
The direction of fuel prices over the coming days will depend on several factors.
The main points to watch are:
- international crude oil prices;
- diesel supply and refining capacity;
- wholesale fuel prices;
- developments affecting Middle Eastern oil supplies;
- the pound against the US dollar;
- how quickly higher wholesale costs are passed on at the pumps.
Oil prices have eased slightly today as concerns over supply disruptions have moderated, but Brent crude remains above $100 per barrel and the diesel market remains tight.
This means the situation remains particularly sensitive to developments in global energy markets.
CheapFill.uk will continue to track UK fuel prices and report on the latest changes each week.
