Sources and methodology
Everything ACUMVIO shows comes from official public data. This page explains where it comes from, how often we update it, and how we calculate averages and forecasts.
Updated: 13 November 2026, by the ACUMVIO team
How a price travels from the pump to your screen
- 1The station
Filling stations report their prices on the French government’s public website. Most of them are required to do so.
- 2prix-carburants.gouv.fr
The French Ministry of the Economy publishes these prices as open data, with the date of each report.
- 3ACUMVIO
Every 30 minutes we fetch the file and calculate averages and price gaps.
- 4You
Every price is shown with its age. “Cheapest” only compares prices less than 72 hours old.
1. Fuel prices
Prices come from the official “Fuel prices in France” feed, published by the French Ministry of the Economy on prix-carburants.gouv.fr under the Etalab Open Licence 2.0. It covers about 10,000 stations in France.
We fetch this feed every 30 minutes. Each price keeps the date on which the station reported it, and that is the date we display (“3 h ago”, “4 days ago”). We never change a price.
2. Old prices and reliability
Some stations update their prices several times a day, others much less often. An old price may no longer be accurate when you reach the pump.
That is why the “cheapest” ranking and comparisons only use prices reported within the last 72 hours. Older prices remain visible with their date, but they are never presented as the best deal.
If the official feed is temporarily unavailable, we show the last known prices with an “indicative prices” banner and their date.
3. Averages and price gaps
The national average for each fuel is calculated every day from all prices reported in France.
On a city page, the average, the lowest price and the price gap are calculated from the stations in that town. The cost of a full tank is given for 50 litres, as a reference.
4. Price forecasts
Every day, a statistical model estimates the likely change in the national average price of each fuel over the next 24 and 48 hours, based on price history.
Each forecast comes with a range (the price has roughly an 8 in 10 chance of falling within it) and a confidence level. It is a trend estimate, not a guarantee: the actual price also depends on each station.
5. Charging stations
The location, power, connectors and operator of charging points come from the national consolidated file of charging infrastructure (IRVE), published on data.gouv.fr under the Etalab Open Licence 2.0.
Availability statuses come from the dynamic IRVE feed, when the operator publishes it. Prices are those reported by operators: they may be missing or incomplete, and we never estimate them.
6. Independence and funding
No fuel brand or charging operator pays to appear on ACUMVIO or to be ranked higher. Results are ordered only by price, distance and the age of the data.
The site is free and requires no account. It is funded by unobtrusive advertising, which is never placed above the prices.
7. Report an error
Does a price look wrong, or is a station closed or in the wrong place? Write to us: we check every report. We do not change official data, but we can hide information that is clearly wrong.
A question about our data?
The ACUMVIO team answers every message.