Weekly fuel price report - week 39, 2026
UK fuel prices: 21 - 27 September 2026
Average UK forecourt prices for the week, calculated by Pennyfill from the UK Government's Fuel Finder open data.
The week in numbers
This week is still in progress, so these figures cover 6 days so far and will change.
Unleaded (E10) averaged 173.5p a litre across the UK.
Diesel (B7) averaged 198.1p a litre across the UK.
Super unleaded (E5) averaged 190.2p a litre across the UK.
Premium diesel averaged 216.5p a litre across the UK.
Diesel averaged 24.6p a litre more than unleaded.
Average prices vs the previous week
| Fuel | Week average | Previous week | Change | Cheapest day | Lowest station price |
|---|---|---|---|---|---|
| Unleaded (E10) | 173.5p | - | - | Monday 21 September (173.0p) | 157.9p |
| Diesel (B7) | 198.1p | - | - | Monday 21 September (197.3p) | 157.9p |
| Super unleaded (E5) | 190.2p | - | - | Monday 21 September (189.9p) | 163.9p |
| Premium diesel | 216.5p | - | - | Tuesday 22 September (216.0p) | 169.9p |
Supermarkets vs other forecourts
| Fuel | Supermarkets | Other forecourts | Gap |
|---|---|---|---|
| Unleaded (E10) | 170.8p | 174.1p | 3.3p cheaper at supermarkets |
| Diesel (B7) | 194.5p | 199.0p | 4.5p cheaper at supermarkets |
| Super unleaded (E5) | 183.5p | 191.8p | 8.3p cheaper at supermarkets |
| Premium diesel | 209.1p | 216.8p | 7.7p cheaper at supermarkets |
Day by day
Over the week so far, the UK average for unleaded went from 173.0p on Monday to 174.0p on Saturday, up 1.0p.
The cheapest day for unleaded nationally was Monday 21 September 2026, at 173.0p on average.
The lowest unleaded price at any UK station during the week was 157.9p a litre.
Supermarket forecourts averaged 3.3p a litre less than other forecourts for unleaded (170.8p against 174.1p).
Over the week so far, the UK average for diesel went from 197.3p on Monday to 199.0p on Saturday, up 1.7p.
The cheapest day for diesel nationally was Monday 21 September 2026, at 197.3p on average.
The lowest diesel price at any UK station during the week was 157.9p a litre.
Supermarket forecourts averaged 4.5p a litre less than other forecourts for diesel (194.5p against 199.0p).
For today's prices see the UK Fuel Price Index. Pennyfill is independent and not affiliated with the UK Government.