GreaseMunky

This is NOT a free app, you can download for free and check out all the features with the existing data, but you will not be able to save any new records. If you try, you will be taken to a feature store to enable the application.
GreaseMunky is a powerful, customizable and easy-to-use mobile application for tracking fuel, maintenance and trip activity. Developed with households in mind, GreaseMunky supports multiple vehicles and multiple drivers, making vehicle history tracking both quick and intuitive.
More than just a simple logging application, GreaseMunky provides useful visualizations of your fuel and maintenance histories, either for single or multiple vehicles. GreaseMunky also allows you to export data from your iPhone into your favorite desktop spreadsheet application.
Finally, GreaseMunky allows you to synchronize data on your phone with other application users via Bluetooth wireless technology. This unique capability makes GreaseMunky a must-have application for you and your family.
All features are enabled from within the application using the built in Feature Store. $2.99US enables all features. Any one of the log types can be enabled for $1.99US. Bluetooth data synchronization is enabled for $0.99US(Bluetooth required).