Perfect (or pretty close)

I have spent the last week looking through every single car maintenance/fuel app on the App Store. This is by far the best one.

It lets you look at fuel efficiency on the graph. It has a great UI and now you can even turn off that annoying sound.

It supports both metric and imperial units. It also lets you add multiple cars and manage them together.

The best part is you can even customize the list of things that you buy. It also tracks your schedule for maintenance items by mileage or time.

The only possible short coming is that it hasnt been updated for a year but it still works great on my iPhone 7 Plus and iOS 10.

Its also free without ads. Wow.

KublaiKant about DrivrLog, v2.2.6