Fuel Log
Track fill-ups with odometer, liters and cost.
Overview
A fuel log is the single most useful thing you can keep for any car, truck, motorcycle, or fleet vehicle you own. Every fill-up records the date, the odometer reading, how much fuel went in, and what it cost, and from those four numbers you get real fuel economy, total spend, and cost per kilometre or mile. Over time the log surfaces declining efficiency before it becomes a breakdown and gives you actual data to compare stations, octane grades, or driving styles.
This tool keeps fuel logs simple and switchable between metric and imperial units, so you can enter litres and kilometres or gallons and miles depending on where you drive. It supports multiple vehicles in one place, tracks the currency you spent in, computes per-fill efficiency, and exports the whole history to CSV when you want to take the data elsewhere.
How it works
Add a fill-up by entering the date, vehicle, odometer reading, fuel volume, cost, and currency. Toggle the mi/gal checkbox to swap between metric and imperial input units; behind the scenes everything is stored in kilometres and litres so the totals stay consistent. Each new row computes the distance since the previous fill-up for that vehicle, then converts that into miles per gallon or litres per 100 km.
The summary strip across the top of the history shows the number of fill-ups, total volume, total spend, total distance, and average economy and cost per distance unit. You can export the full log to CSV at any time and delete individual rows inline if you mistype an odometer reading.
Examples
- Three Honda Civic fill-ups over three weeks at 500 km intervals: the summary calculates roughly 6.5 L/100km and shows total spend in USD.
- Switching to imperial: toggle mi/gal and the same data reflows as MPG with cost per mile and cost per gallon.
- Tracking two cars: enter "Honda Civic" and "Toyota Tacoma" as separate vehicle names and the per-row efficiency calculation only chains fill-ups of the same vehicle.
- Exporting for taxes or reimbursement: click Export CSV to copy a spreadsheet-friendly list of every fill-up.
FAQ
Do I need to fill the tank to the top each time?
For accurate fuel economy, yes. Partial fills break the math because the litres recorded do not match the distance driven since the previous full tank.
Can I mix currencies?
Each entry stores its own currency code, but the totals assume a single currency. If you drive across borders, expect the spend chip to be a rough sum rather than a converted figure.
What units does the tool save in?
All data is persisted in kilometres and litres. The mi/gal toggle only affects how you enter and read values; switching back and forth is lossless.
Can I edit a row after saving?
Not directly. Delete the row using the trash icon and re-add it with the corrected values.