The trip computer resets when it feels like it and flatters you by a few per cent. A fuel log does not: it is the same arithmetic every driver used to do on the back of a receipt, with the log doing the dividing. Enter the litres, the total, the odometer and whether you filled the tank, and every fill-up gets its own litres per 100 km, while the price per litre across the year keeps itself current.
Opens Log App and adds this log with example entries. You can clear the examples anytime.
On a computer? Scan this with your phone’s camera to set it up there.
Litres, cost, the odometer, and whether the tank went right to the top.
Also called a fuel economy tracker, mpg log, petrol logbook or gas mileage app.
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‹Fuel log⚙
carmoney
6.9l/100 km
Average Consumption · 6 entries
Sat 24 Oct
7 l/100 km Consumption · 47.6 l Litres · 75.2 € Cost · 129880 km Odometer · 680 km Distance · Yes Full tank
Wed 21 Oct
7.2 l/100 km Consumption · 30.1 l Litres · 52.6 € Cost · 129200 km Odometer · 420 km Distance · Yes Full tank
“Motorway stop at 1.749. Sixteen cents dearer than the ring road, and I knew it.”
Sat 17 Oct
7 l/100 km Consumption · 48.6 l Litres · 77.7 € Cost · 128780 km Odometer · 690 km Distance · Yes Full tank
Mon 12 Oct
6.2 l/100 km Consumption · 20.5 l Litres · 32.4 € Cost · 128090 km Odometer · 330 km Distance · No Full tank
“Twenty euros to get home. This tank reads low; the next full one reads high.”
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What you’ll track
The Fuel log log, out of the box
One entry per session, with the timer and location always available. Add or rename variables any time in log settings.
Variable
Type
Stats shown
Consumption · l/100 km
Formula · Litres ÷ (Odometer − Odometer (previous)) × 100
Average
Litres · l
Number
Sum, Average
Cost · €
Number
Sum, Average
Odometer · km
Number
Max
Distance · km
Formula · Odometer − Odometer (previous)
Sum
Full tank
Yes / no
Count and share of yes
Timer
Built in
Total time, per entry duration
Location
Built in
Pin or place, shown on the log map
Notes, photos, sketches, voice memos
Built in
Attached to any entry
6.9l/100 km
Average Consumption
238l
Sum Litres
39.6l
Average Litres
382€
Sum Cost
How it works
From install to first entry in a minute
1
Pick “Fuel log” during setup
The log is created with the variables above and a few example entries so you can see how it works. Clear them with one tap.
2
Log as you go
Tap plus, fill in what you have, save. Timer, location, notes and photos are there when you want them, hidden when you don’t.
3
Let the stats accumulate
Average consumption sits on the log card, with the rest one tap away. Set a goal if you want a nudge.
Why this log
Built for the way you actually do it
Litres per 100 km for every tank, not the computer’s guess
Each fill-up divides its litres by the kilometres since the one before, straight from the odometer, and shows the result in l/100 km. The average settles within a couple of per cent after four or five tanks, and it is usually a little worse than the dashboard claims — which is the point of measuring it.
Partial fills marked, so a strange figure has an explanation
Consumption only works out if the tank reached the same point both times. The "Full tank" switch records the ones that did not, so when a tank reads suspiciously good you can see why instead of doubting the whole log.
What a litre really costs you over a year
Price per litre across every fill-up, motorway prices and cheap Tuesday evenings together. It is the figure to hold against a fuel-card offer, and the one that shows whether the detour to the cheap station is worth the detour.
Everything else in the app
Not just a form. A logbook that thinks with you.
The Fuel log log is one log among many you can keep. Every one of them gets the same tools.
💡AI analysis
AI reads the pattern for you
Tap the bulb on Fuel log and get a plain-language read of your trends, what changed recently, and a suggested next goal, built only from your own entries.
🎯Goals
Goals, streaks and reminders
Set a target like three times a week, watch the rolling progress bar, keep a streak, and get a reminder at the time you actually log. The app learns that time from you.
📅Calendar
A calendar heatmap per log
Every log has its own month view showing which days you logged. Gaps are obvious, consistency is visible, and one tap opens that day's entries.
🔁Rounds
Several rounds in one entry
Every exercise in a workout, every piece in a practice session: logged together in one entry, broken out automatically in the stats.
📷Attachments
Photos, sketches, voice memos
Attach a photo, draw a quick sketch, or record a voice note on any entry. They stay with that entry and come back on every device you sign in on.
🗺️Map
Every entry on a map
Drop a pin or search for the place. Each log has a map view of everywhere you logged, and saved places open directly in Google Maps.
🔍Search
Search across everything
Find an entry by title, note or value across every log, filter by date or location, and jump straight to it.
🔒Privacy
Yours, offline first
Entries save on your phone first and sync when you sign in. No account needed to start, no feed, no one else sees your data.
Who keeps a fuel log
People who claim mileage and need dates, odometer readings and litres that stand up at tax time. People running an older car who want to know whether consumption is creeping up, because a slow climb over six months is the first sign of something worth fixing and the dashboard average hides it. And people who simply drive a lot and resent not knowing what the driving costs.
It is also the log for anyone arguing with a claimed figure. A manufacturer says 5.8 l/100 km; your own tanks say 7.0, and after a dozen fill-ups that is not a bad week, it is the number. Whether you do anything with it is up to you, but it stops being a debate.
What a month of fill-ups shows
The consumption figure stops moving after about four full tanks. Before that it jumps around with how you drove that week; after it, a change means something real — a roof box left on, a set of winter tyres, a fortnight of short cold trips. The entries with a note attached are the ones worth reading back, because they say what was different.
Price per litre moves the other way: it barely changes week to week and then drifts over months. Against it you can see exactly what motorway fuel costs you in a year, which in the sample above is one fill-up in six at roughly ten per cent more. That is a small enough number to accept deliberately, and a large enough one to be worth seeing.
Questions
Frequently asked
Do I need to reset the trip meter?
No. Type the odometer reading at each fill-up and the log works out the kilometres since the last one, and the consumption from them. The first fill-up has no reading before it, so it has no figure; every one after it does.
Can I use miles and gallons?
The odometer converts to miles on a device set to imperial. Litres and l/100 km stay as they are, because the formula is litres over kilometres; if you fill up in gallons, rename the field and its unit and read the figure as gallons per 100 km.
Do I have to fill the tank every time?
No, but mark the ones you do not. A run of full tanks gives a consumption figure you can trust; a partial fill reads low and the full one after it reads high, which averages out but looks odd on a single entry.
Where do the other car bills go?
Service, insurance, tyres and parking go in a car running costs log next to this one. This log is the fill-ups and what they say about the car; the other is what the car costs a month.
