I like Fuel Monitor, compared to other options. Its a good app with great graphics and gives you a comprehensive look at how your vehicle is doing, what it all costs you, and what you should plan for. Its not quite a five-star app for two reasons, in my opinion: 1) The backup and sync process are unnecessarily clumsy. Should be an easy way to sync this on your iPhone/iPad/Mac, but as it is you have to download bits of data from one and then try to import that to the other. They are drawing from the same database, so you should be able to export/import all data - fuel, service, repairs - by wifi or the cloud. Except you cant. Too clunky. 2) Customizing service intervals and other reminder-type things should be more user-shaped and better integrated. Other than that, a fine app!