Route & Fuel app iconRoute & Fuel UKSmarter fuel stop decisions
Product logic

How Route & Fuel calculates savings.

Route & Fuel is designed around estimated fuel saving after extra driving: the useful amount left after comparing station prices with route, detour and planning MPG details.

By Route & Fuel editorial team · Reviewed 20 June 2026

The core idea

Cheap fuel is only useful if getting to it does not wipe out the benefit. Route & Fuel is built to keep that comparison visible in the app.

How the app talks about it

The nearby check starts with the local station price. The journey check then adds where the stop sits on your route, the extra fuel needed to reach it and any live-traffic delay, so the app can show the saving that is likely to remain before you commit.

Inputs the saving can use

Fuel priceStation price per litre
Fill amountTank or estimated litres
Route detailsDistance and detour
Live trafficDetour timing
Your carplanning MPG, tank and fuel type

Example saving after extra driving flow

  1. Compare selected station prices against a relevant nearby or on-route benchmark.
  2. Estimate the gross saving based on expected litres.
  3. Estimate extra fuel used by the detour using planning MPG details.
  4. Show detour time with live traffic separately, and show current-fuel reachability as an estimate rather than a guarantee.
  5. Show the remaining estimated saving clearly before the driver commits.

Why this matters

Without route, planning MPG and tank details, every driver can be shown the same “cheap” result. Route & Fuel aims to make the result more useful for the specific driver and journey.

Important note

Fuel prices, availability and journey conditions can change. Route & Fuel is decision support, not a guarantee. Drivers should always confirm the final price at the station.