Coverage of the data

The observation record for this site began on 18 October 2026, the first day we accepted a Fuel Finder file from the Department for Energy Security and Net Zero. Everything before that date is outside it, because we did not hold the file then and we do not fill gaps with estimates.

Two collections a day are due. Every page states how many of those collections were made and how many distinct publisher releases they hold. A repeated file is still one release. No window is complete yet, and no area median has been published yet.

Window names are earned, not assumed. A window is called seven days only when the full calendar span has passed and at least six days were observed. A thirty-day window needs the full span and at least four fifths of its days. Otherwise the label names the days actually observed.

Publishing floors apply to every cell, including each brand, grade and window combination. Fewer than three reporting stations means no page. Three or four means a median and a count, with no spread and no ranking. Five or more allows a spread. A persistence figure needs at least four complete observed weeks.

Worked example, CR0. Stations reporting E10 petrol: 14 stations. Three scheduled collections of three due. They hold one distinct publisher release.