9 October 2026. Price snapshot: 17:55 BST.
The average diesel price has slipped below £2 a litre. But following the same forecourts over the past fortnight reveals how little of the recent spread of £2 pricing has been reversed.
Among 6,082 forecourts with qualifying current reports and a retained price at each comparison date, 2,175 now report diesel at £2 or more. Two weeks ago, the figure was 1,431.
That is 744 more forecourts, an increase of 52% within this matched group. The share above the threshold has risen from 23.5% to 35.8%.
The first falls are real. They have made a small dent in a much larger rise.
A falling average, with £2 pricing still widespread
The RAC reported diesel at 199.90p a litre on 9 October, a daily fall of 0.11p. A week earlier, its average had passed £2.
I wanted to look beyond that milestone. How many of the same forecourts had actually moved back below £2, and how did that compare with the number crossing above it?
For this analysis, I reconstructed the reported diesel price at each of the same 6,082 forecourts on 25 September, 2 October and 9 October, using the same time of day at each date.
| Snapshot | Matched forecourt average | Forecourts at £2 or more | Share of the group |
|---|---|---|---|
| 25 September | 198.51p | 1,431 | 23.5% |
| 2 October | 200.16p | 2,220 | 36.5% |
| 9 October | 199.93p | 2,175 | 35.8% |
These are Fuel Finder's matched forecourt averages, calculated separately from the RAC's figures. Each forecourt has equal weight. The results describe available reported prices, rather than the average paid across litres sold.
The weekly mean fell by 0.23p a litre, equivalent to about 13p on a 55-litre fill. Over the fortnight, it remained 1.41p higher, equivalent to about 78p on the same fill. Those are illustrations based on this group's averages, rather than measured household savings.
358 crossed below £2. Another 313 crossed above it.
Looking only at forecourts that became cheaper misses movement in the other direction.
Between 2 and 9 October, 358 forecourts moved from £2 or more to below £2. But 313 moved from below £2 to £2 or more.
The net result was just 45 fewer £2-plus forecourts in the group. Almost nine upward crossings occurred for every ten downward crossings.
Across the whole group, 1,820 forecourts had a lower reported diesel price than a week earlier, 2,889 were unchanged and 1,373 were higher. The median forecourt price change was zero.
That is a mixed market. Some drivers have cheaper fuel available, while other forecourts have continued to rise. A small movement in the mean cannot tell a driver which of those situations applies locally.
Most newly sub-£2 prices were 199.9p
Of the 358 forecourts that crossed below £2, 284, or 79.3%, were priced at exactly 199.9p at the closing snapshot.
At 199.9p, a 55-litre fill costs £109.945 before payment rounding, approximately £109.95. That is only about 6p below the £110 cost at exactly £2 a litre.
That does not mean these forecourts cut prices by only 0.1p. Among the 284 that moved from £2-plus to 199.9p, the median reduction was 2p a litre, worth £1.10 on 55 litres.
Nor is the cluster proof of a particular pricing strategy. Prices ending in .9 were already common in this dataset. There were actually fewer forecourts at exactly 199.9p at the latest snapshot than a week earlier, as sites moved in both directions.
The distinction matters: crossing the £2 boundary can follow a useful reduction, but being just below it still leaves a fill-up very close to £110.
What this means when you fill up
The useful question remains the actual price at the forecourts you can reasonably use. A 3p difference is £1.65 on 55 litres. A national milestone does not establish that such a saving is available nearby.
Check the latest reported local prices before a journey, and allow for the distance, access conditions and report age. The UK Fuel Price Index tracks the broader movement; Fuel Finder's local comparison shows the prices relevant to your trip.
How this analysis was calculated
The comparison uses a frozen extract of Fuel Finder UK's production price database, based on the official Government Fuel Finder feed. The cutoffs are 17:55:19 BST on 25 September, 2 October and 9 October 2026. The latest date is a partial-day snapshot.
The main group contains 6,082 currently eligible forecourts with a valid standard-diesel price at all three dates. Current prices must have an accepted per-fuel source or history timestamp within the preceding 14 days. Inactive sites, closures, missing government-inventory entries, test records and invalid locations or postcodes are excluded. Motorway and membership forecourts remain in the main group. Standard diesel is principally B7, with B10 used where it is the selected source observation.
Historical prices are reconstructed from the latest retained observation at or before each cutoff. An unchanged price is carried forward, rather than treating every history row as a separate forecourt. A site is £2-plus at 200.0p or more; 199.9p is below the threshold.
The database does not retain every past reconfirmation or historical closure state. This is a comparison of currently qualifying forecourts with retained histories, rather than a census of every forecourt operating on each past date. Tighter freshness rules select a different group, so the exact counts depend on eligibility.
The two-week increase in £2-plus forecourts remained under alternative checks: 34% with a seven-day current-freshness limit, 43% when both historical baselines had a retained observation within the preceding 14 days, and 50% with a 30-day historical limit. Removing motorway classifications, government motorway flags and Costco also left an increase. These checks support the direction of the finding; they do not make the group a random national sample.
The analysis measures reported forecourt prices. It cannot establish litres purchased, retailer margins, reasons for individual changes or what prices will do next.