Android: It can be hard to keep track of everything related to your car, like recent fill-ups, mileage, maintenance, or your last oil change. DriverDiary keeps track of it all for you in a tidy Android app.
DriveryDiary has logs for just about everything you could possibly need, from simple fill-ups to a section to store part numbers for things like oil filters or spark plugs that you buy yourself. Its milage tracker is pretty helpful, too, tracking how much you're spending on gas, what kind of mileage you're getting, and even linking that to the kind of driving you're doing. And, if you want to view and edit it on your computer, you can export everything into .csv format for tweaking in Excel.
There's even a pro version that adds a few extra features, like the ability to back up your data or take pictures of your service receipts for later reference.
DriverDiary is a free download for Android only.