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Product21 Jun 2026 · 5 min read

How our 7-day AI price forecast actually works

The Fuel Checker Team
The Fuel Checker Team

Our 7-day forecast tells you whether to fill up today or wait. It is not a crystal ball - it is a blend of a boring, reliable statistical model and a language model reading the news that moves prices. Here is what is going on under the bonnet.

A statistical baseline

Every forecourt carries weeks of its own price history. From that we build a baseline that captures the things prices reliably do: the lag between wholesale moves and the pump, weekly rhythms, and how quickly a given site tends to follow its neighbours. On its own this baseline is already a decent predictor over a few days.

Then Claude reads the market

Baselines miss the things that have not happened yet - a refinery outage, a supermarket price war, a sharp move in the pound against the dollar. We give Claude the recent price trend plus a digest of current market signals and ask it to adjust the outlook and explain why. That is where lines like "supermarkets cutting across the North West" or "sterling softness offsetting a crude fall" come from.

Why combine the two

The statistical model is steady but blind to news; the language model is great at context but should not be trusted to do arithmetic on its own. Blending them gives you a number with a reason attached - and a confidence level, so you know how much weight to put on it.

What it is not

It is guidance, not financial advice, and it can be wrong - especially around sudden geopolitical shocks. Treat it the way you would a weather forecast: very useful for deciding whether to wait a day, not a guarantee. The pump price you see in the app is always the real one to act on.

Put it into practice
Find the cheapest fuel near you and plan the whole trip.
Open the Fuel Map

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