UK fuel prices in September 2026
Petrol averaged 170.1p a litre in September 2026 and diesel 193.1p, with the daily highs and lows, brands and regions.
The month in brief
Petrol (E10) averaged 170.1p a litre in September 2026, and diesel (B7) averaged 193.1p.
Petrol rose 12.5p through the month, from 162.1p on 1 September to 174.6p on 30 September. Diesel rose 16.2p, from 183.7p on 1 September to 199.9p on 30 September.
Against August, petrol was 8.6p a litre dearer and diesel 10.9p dearer.
Daily UK averages from our price data, across about 7,700 forecourts a day with a petrol price.
On 11 days, most of the prices behind the average were more than 3 days old.
The month in figures
| Fuel | Average | 1 Sep | 30 Sep | In the month | Highest | Lowest | Against August |
|---|---|---|---|---|---|---|---|
| Petrol (E10) | 170.1p | 162.1p | 174.6p | up 12.5p | 174.6p on 30 Sep | 162.1p on 1 Sep | up 8.6p |
| Super unleaded (E5) | 187.4p | 179.0p | 192.2p | up 13.2p | 192.2p on 30 Sep | 179.0p on 1 Sep | up 8.5p |
| Diesel (B7) | 193.1p | 183.7p | 199.9p | up 16.2p | 199.9p on 30 Sep | 183.7p on 1 Sep | up 10.9p |
| Premium diesel | 212.2p | 203.2p | 218.6p | up 15.4p | 218.6p on 30 Sep | 203.2p on 1 Sep | up 11.6p |
Single forecourt prices ran from 147.9p to 209.9p a litre for petrol, and from 154.9p to 239.9p for diesel. Prices far from what the rest of the UK charged that day are left out.
Each fuel's daily UK average from our price data, averaged over the days of the month.
Petrol and diesel each day
The UK average price of petrol (E10) and diesel (B7) each day in September 2026, in pence a litre.
- Petrol was highest at 174.6p on 30 September, and lowest at 162.1p on 1 September.
- Diesel was highest at 199.9p on 30 September, and lowest at 183.7p on 1 September.
Daily UK averages from our price data: each forecourt's price in effect at the end of the day.
What a tank cost
At the month's averages, a 55-litre tank cost £93.56 with petrol and £106.21 with diesel.
That was £4.73 more than in August for petrol, and £6.00 more for diesel.
A gallon cost £7.73 for petrol and £8.78 for diesel, at 4.54609 litres a gallon.
Supermarkets and other forecourts
Supermarket petrol averaged 3.5p a litre less than petrol at the major brands in September, and supermarket diesel 4.2p less.
The petrol gap was widest at 5.0p on 9 September, and narrowest at 2.0p on 30 September.
The diesel gap was widest at 5.4p on 22 September, and narrowest at 2.8p on 30 September.
In August, the gap averaged 2.6p for petrol and 4.2p for diesel.
Supermarkets here are Tesco, Morrisons, Asda and Sainsbury's. The major brands are Esso, BP, Shell, Texaco and 7 more.
Daily brand averages from our price data, each group weighted by its forecourts, not counting motorway services.
Prices by brand
Costco had the cheapest petrol of these brands, at 160.9p. Shell had the dearest, at 173.0p.
Costco had the cheapest diesel of these brands, at 182.9p. Gleaner had the dearest, at 196.0p.
| Brand | Petrol (E10) | Against August | Diesel (B7) | Against August |
|---|---|---|---|---|
| Costco | 160.9p | up 7.6p | 182.9p | up 10.0p |
| Go | 161.4p | up 9.7p | 184.6p | up 14.7p |
| Maxol | 163.7p | up 9.6p | 187.4p | up 11.9p |
| Solo | 163.8p | up 9.6p | 187.9p | up 12.2p |
| Emo | 164.8p | up 10.8p | 187.9p | up 11.2p |
| Circle K | 165.3p | up 9.9p | 188.2p | up 11.2p |
| Tesco | 167.0p | up 7.9p | 189.4p | up 11.0p |
| Asda | 167.0p | up 7.9p | 189.9p | up 11.0p |
| Sainsbury's | 167.1p | up 7.4p | 189.1p | up 10.2p |
| Co-op | 167.4p | up 8.1p | 189.7p | up 10.5p |
| Morrisons | 167.4p | up 7.9p | 190.5p | up 10.8p |
| Applegreen | 167.7p | up 9.0p | 190.3p | up 10.7p |
| TotalEnergies | 168.4p | up 9.5p | 191.9p | up 12.1p |
| JET | 168.5p | up 8.5p | 191.9p | up 10.8p |
| Essar | 168.6p | up 8.5p | 191.6p | up 10.4p |
| Texaco | 168.9p | up 8.9p | 192.3p | up 11.4p |
| Murco | 169.0p | up 8.7p | 191.9p | up 10.9p |
| Spar | 169.4p | up 8.3p | 192.4p | up 11.2p |
| Valero | 169.4p | up 8.6p | 193.1p | up 10.6p |
| EG On The Move | 170.1p | up 9.0p | 193.8p | up 11.6p |
| Pace | 170.3p | up 8.6p | 193.5p | up 10.1p |
| Gulf | 170.3p | up 8.6p | 193.7p | up 10.6p |
| Esso | 170.7p | up 8.7p | 194.2p | up 11.1p |
| BP | 171.4p | up 8.8p | 194.7p | up 11.0p |
| Highland Fuels | 172.3p | up 9.1p | 195.4p | up 10.3p |
| Gleaner | 172.9p | up 8.7p | 196.0p | up 10.1p |
| Shell | 173.0p | up 8.9p | 195.7p | up 10.3p |
Each brand's daily average from our price data, at its forecourts away from motorway services, averaged over the month.
Prices by region
Petrol was cheapest in Northern Ireland, at 163.8p, and dearest in the South East, at 171.7p.
Diesel was cheapest in Northern Ireland, at 187.2p, and dearest in the South East, at 194.6p.
| Region | Petrol (E10) | Against UK | Diesel (B7) | Against UK |
|---|---|---|---|---|
| Northern Ireland | 163.8p | −6.3p | 187.2p | −5.9p |
| Yorkshire | 169.0p | −1.1p | 192.4p | −0.7p |
| North East | 169.1p | −1.0p | 192.8p | −0.3p |
| Wales | 169.5p | −0.6p | 192.8p | −0.3p |
| North West | 169.9p | −0.2p | 192.9p | −0.2p |
| East Midlands | 170.5p | +0.4p | 193.0p | −0.1p |
| South West | 170.6p | +0.5p | 193.6p | +0.5p |
| East of England | 170.6p | +0.5p | 193.5p | +0.4p |
| London | 170.8p | +0.7p | 194.3p | +1.2p |
| West Midlands | 170.8p | +0.7p | 193.7p | +0.6p |
| Scotland | 171.4p | +1.3p | 194.6p | +1.5p |
| South East | 171.7p | +1.6p | 194.6p | +1.5p |
Regions follow postcodes, so a forecourt counts in the region its postcode is in. London is Greater London.
Each region's daily average from our price data, averaged over the month.
Gaps between fuels
Diesel cost 23.0p a litre more than petrol on average in September.
The gap was 2.3p wider than in August.
On average, super unleaded (E5) cost 17.3p more than petrol (E10), and premium diesel cost 19.1p more than standard diesel.
Worked out from the month's UK averages in our price data.
What changed in September
On 1 September, HMRC's new advisory fuel rates for company cars began: 14p to 27p a mile for petrol, and 15p to 22p for diesel.[1] They had been 14p to 26p and 15p to 23p.[1]
The last twelve months
| Month | Petrol (E10) | Diesel (B7) |
|---|---|---|
| September 2026 | 170.1p | 193.1p |
| August 2026 | 161.5p | 182.2p |
| July 2026 | 153.7p | 169.1p |
| June 2026 | 154.9p | 174.9p |
| May 2026 | 158.2p | 186.1p |
| April 2026 | 157.2p | 189.9p |
| March 2026 | 143.3p | 163.4p |
Common questions about fuel prices in September
What was the average price of petrol in September 2026?
Petrol (E10) averaged 170.1p a litre in September 2026, from our daily UK averages. Super unleaded (E5) averaged 187.4p.
Did fuel prices go up or down in September 2026?
Petrol rose 12.5p through the month, from 162.1p on 1 September to 174.6p on 30 September. Diesel rose 16.2p through the month, from 183.7p on 1 September to 199.9p on 30 September. Against August, petrol was 8.6p a litre dearer and diesel 10.9p dearer.
What was the cheapest day to buy diesel in September 2026?
The UK average for diesel was lowest on 1 September, at 183.7p a litre. It was highest on 30 September, at 199.9p.
How we work it out, and how to cite it
Our figures come from the UK Government's Fuel Finder scheme, which we check every 15 minutes.
Each day's UK average is over every forecourt's price at the end of that day in our price data. We count prices reported in the last 30 days.
We leave out prices far from what the rest of the UK charged that day. The month's figure is the average of its daily figures.
To cite this report: Forecourt Prices, "UK fuel prices in September 2026", https://forecourtprices.co.uk/articles/uk-fuel-prices-september-2026
- GOV.UK (HMRC): Advisory fuel rates, checked 16 October 2026.