You can name each vehicle you want to track in MyRideTrac by keying a unique vehicle name in the settings screen.  When you want to change vehicles, just go to the Settings Screen and type in the name of the vehicle you want to track (e.g. "Kens Honda", or "Infiniti").  MyRideTrac will immediately begin tracking your miles under the vehicle name in the Settings Screen.  When you want to change back, just type in the vehicle name in the Settings Screen. If you are currently in a ride, you should hit STOP to end the current ride before switching vehicle names.  Whatever vehicle name is current is what gets logged when you switch your status (from RIDER to NORIDER for example).