The number most drivers never know
Ask a car owner what their car costs and you'll hear the fuel price. But fuel is only part of the truth. The honest metric is cost per kilometer — and once you know it, decisions change: whether a trip is worth driving, whether the old car is cheaper than a new one, whether that "bargain" repair actually pays off.
The method: three numbers per refuel
You don't need a complex system. Each time you fuel up, record three values:
- Odometer reading — the current mileage;
- Liters — how much you filled;
- Price — what you paid.
From two consecutive refuels the math is simple: distance driven = difference between odometer readings; consumption = liters ÷ distance × 100 (L/100km, or MPG if you prefer); fuel cost per km = money spent ÷ distance. Track it over months and you get your car's real appetite across seasons — winter consumption alone usually surprises people.
Add the costs everyone forgets
Fuel feels expensive because you pay it weekly. Repairs and maintenance hurt more but are easy to mentally "archive". To get the true cost per kilometer, add them in:
- Repairs — unplanned fixes, parts;
- Scheduled maintenance — oil, filters, brakes, tires;
- Optionally insurance and taxes, divided across yearly mileage.
Total cost ÷ total kilometers over the same period = the number that actually describes your car. For most cars it's 2–4× the pure fuel figure.
How FinMan automates all of this
Manually maintaining this in a spreadsheet works for about three weeks — the same discipline problem as anymanual expense tracking. In FinMan the whole input is two photos sent to the Telegram or WhatsApp bot: the fuel receipt and the odometer. AI reads the price, liters and mileage, links the refuel to your car and computes consumption and cost per kilometer automatically. Repairs are regular expenses assigned to the car category — they join the same analytics.