The simple model
A practical saving estimate starts with the difference between the expensive option and the cheaper option, then subtracts the cost of reaching the cheaper option.
Step 1Price gap per litre
Step 2Estimated litres
Step 3Extra fuel used
Step 4Net saving
Example
If one station is cheaper, the headline saving looks attractive. But a detour has a fuel cost. The better decision is the remaining saving after that cost.
Net saving = estimated price saving − estimated detour fuel cost.
Why your vehicle matters
Two drivers can see different real savings for the same station. A vehicle with different MPG, fuel type or tank size can change whether the stop is worthwhile.
Why Route & Fuel is different
Instead of leaving drivers to do this mentally, Route & Fuel is designed to put price, route, detour and vehicle details together in the app.