Can I Use Wisepetrol On More Than One Vehicle?

Yes, provided the other vehicle is also OBD2-equipped and compatible.

Unplug the device from the first vehicle and plug it into the second. Check compatibility before moving it over — see Will Wisepetrol Work With My Car?

Wisepetrol works with one vehicle at a time. If you want it running in more than one car at once, you need a device for each.