The most complete Play Store app. It shows the actual consumption at the pump, and the cost per mile for cars that have on-board computers and for cars that do not have on-board computers (the application calculates by the odometer of the vehicle from the second supply).
It's the only one that keeps your data saved in the cloud, so when you switch phones, you can continue to use the application without losing any data already saved.
In addition, you can generate complete reports that show how many miles you rode in the month, how much is the average MPG of your vehicle, how many gallons you used and how much you spent in the month. There is the possibility of registering several vehicles.
You also have the possibility to put the maintenances made in your vehicle, so it is easier and more practical to know everything about your vehicle in the palm of your hand.
And in case you change your cell phone, lose it or it is stolen, no problem. As the application maintains a database in the cloud (google servers), it is only you enter with your login and password that all your data are saved.