Fleet Fuel Bill Index
UK diesel pump prices rebased to 100 at the week commencing 20 July 2026, the first week in THRIVE's series - a single number for how much a diesel fleet's fuel bill has moved since.
Updated weekly · latest week commencing 26 October 2026
UK diesel cost 199.22p per litre in the week commencing 26 October 2026 - a Fleet Fuel Bill Index of 119.2, 19.2 points above its base of 100 set at the week commencing 20 July 2026 (THRIVE, from DESNZ).
Your fleet's energy bill, week by week
Assumptions
Week commencing 26 October 2026
22.0p a mile, blended
- Energy bill this week£19,044
- At this week's prices, a year£990,272
- Against 20 July 2026+£146,111 a year (+17.3%)
The first week of this tax year (6 April 2026) is before THRIVE's series begins, so the baseline is the first week available.
Diesel 25.2p and electric 9.4p a mile this week. Download this view as CSV · JSON
The index, weekly
100 = the week commencing 20 July 2026
| Category | Value |
|---|---|
| 20 Jul | 100 |
| 27 Jul | 104.1 |
| 3 Aug | 107.2 |
| 10 Aug | 108.9 |
| 17 Aug | 109.2 |
| 24 Aug | 109.4 |
| 31 Aug | 109.8 |
| 7 Sept | 111.5 |
| 14 Sept | 114.1 |
| 21 Sept | 117 |
| 28 Sept | 118.3 |
| 5 Oct | 119.4 |
| 12 Oct | 119.7 |
| 19 Oct | 119.3 |
| 26 Oct | 119.2 |
Where it stands
vs the base week
| Category | Value |
|---|---|
| vs the base week | 119.2 |
Use this data
Citation: THRIVE Fleet Fuel Bill Index, week commencing 26 October 2026. thrivefleet.co.uk/data/fuel-bill-index/2026-10-26
Permanent link for this week: thrivefleet.co.uk/data/fuel-bill-index/2026-10-26
Free to use in articles, presentations and reports. Please credit THRIVE and link to this page. It is a request, not a condition of use: see the data terms.
Pump prices in pence per litre are hard to feel. Rebasing them to an index - 100 at the base week - turns the same DESNZ data into a running tally of how much more, or less, a diesel fleet is paying to fill up than it was then. An index of 105 means a 5% heavier fuel bill for the same mileage.
It is the diesel-side counterpart to the Fleet Cost Index: one tracks the absolute cost gap to electric, this one tracks how the diesel bill itself is trending.
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Base: the diesel pence-per-litre of the week commencing 20 July 2026, 167.08p, the first DESNZ week in THRIVE's series. The rule was the first week on or after 5 January 2026; THRIVE's series starts later, so its first week is the base. Each week's index is 100 × that week's diesel price ÷ the base. The base is set once from real data and never recomputed.
Source: DESNZ weekly road fuel prices under the Open Government Licence v3.0. The base reads live from the rates API.
Figures checked against GOV.UK on 27 October 2026.
Free JSON API - no key, open CORS, cache-friendly:
curl https://www.thrivefleet.co.uk/api/v1/fuel-bill-index{ "unit": "index (100 = base week)",
"weeks": [ { "week": "…", "index": …, "diesel_ppl": … } ] }Free to use. Please credit THRIVE and link to the page a figure came from: a request, never a condition of use. See the data terms and the API guide.
How much have UK fleet fuel costs risen?
On the Fleet Fuel Bill Index - diesel rebased to 100 at the week commencing 20 July 2026 - the latest reading is 119.2, 19.2 points up on that base week.
Fleet running costs: the guide · Fleet fuel budgets: the guide