Car Log (Fuel & Maintenance)

A log for one or more vehicles: record fill-ups, charges, services and other costs, and see the fuel economy, cost per kilometre, monthly spending and which service is due next. Everything stays on this device.

How to use

1. Press "Add a vehicle" and choose its fuel, distance unit and fuel unit. Remove the example records first if you do not need them.
2. On "Fill-ups", enter the date, odometer, amount filled and amount paid. Untick "Filled to full" for a partial fill.
3. Record work on "Services" and insurance, parking or tolls on "Other costs".
4. On "Service reminders", add each item with the interval from your owner's manual to see the next due distance and date.
5. Use "Data and print" to save a CSV file, back up as JSON, print the log or print a blank form.

How it works

• Fuel economy uses the full-to-full method: distance between two full fill-ups ÷ all fuel added after the first one, including partial fills. Fills before the first full fill-up are not measured.
• The cost per km uses the fuel of the measured segments; "All costs per km" divides every recorded cost by the distance between the lowest and highest odometer readings.
• No service intervals are built in. Records are kept in this browser only; back them up to keep a copy.

Questions and answers

How do I calculate fuel economy from fill-ups?

Fill to full, note the odometer, and at the next full fill divide the distance driven by the fuel added. 600 km on 45 litres is 13.3 km/L.

What do I do with a partial fill?

Record it with "Filled to full" unticked. Its fuel is added to the next full fill-up, so the economy stays correct.

How do I know when the next oil change is due?

Add a reminder with the interval in distance or months from the manual. The next due point is counted from the latest service record with the same item name.

Can I move my records to another device?

Yes. Back up as JSON and restore it on the other device, or save a CSV file and import it there.