Daily My Trip with OBD2

You have the bluetooth device for obd2 elm327.
Use your old phone.

1. Your phone>>Settings>>Bluetooth register the device contains obd.
2. Run the App.
3. Input your car fuel tank size.
4. Restart the App.
5. The App automatically writing the driving and fueling.
6. The App is only running on screen.

It use fuel tank sensor with a high error rate.
But, accumulating fuel consumption is close to actual consumption.

Exclude cars that continue to stop/start the engine for fuel savings.