Adding entries to your logbook
In the app, tap the My Car button at the bottom of the screen.
Make sure you have a car added to your profile and have the right car selected (if multiple cars are present on your profile).
Then you will have the option to 'Add Fuel Log' on the screen. Follow the instructions on screen and enter the required information. When asked to enter your mileage at fill up, enter your odometer reading.
Calculating your fuel economy
While making an entry in the fuel log, you'll be presented the option to calculate fuel economy.
Fuel economy is calculated using the mileage of your latest and last fuel log. Two consecutive, complete fill-ups are required to calculate this.
If you indicate a missed or partial fill-up, the fuel economy will not be calculated.