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What will this drive actually cost?
Distance, consumption and pump price. The per-kilometre figure is the one worth remembering.
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Litres per 100 km, not miles per gallon
The calculation is linear in both distance and consumption: litres equal distance multiplied by consumption divided by 100. Cost is litres multiplied by the pump price. The per-kilometre cost is just consumption divided by 100, multiplied by price, which makes it easy to compare two cars without repeating the trip length.
Where real consumption differs
Urban stop-start traffic, cold starts, air conditioning, roof racks and a full load all raise consumption above the official figure. Motorway cruising at high speed also raises it. Treat the result as a floor when comparing routes.
Frequently asked questions
Can I use miles and gallons?
The fields are labelled in kilometres and litres. Convert first: one US gallon is 3.785 litres and one mile is 1.609 kilometres.
Does it include tolls or parking?
No. Only fuel is modelled; add tolls and parking separately to get the full driving cost.
Why is the per-person figure lower than what each person pays?
It only divides fuel, not wear, insurance or the driver's time. It is a fair split of the fuel bill, not of the true cost of the car.
What consumption should I enter?
The long-run average shown by the trip computer, not the best figure from one motorway run. A realistic average makes the estimate useful.