How do I share a cars premium features?

Hi,

me and my wife have one car and we’d like to use both the premium features for this one car. There is a group feature, however I don’t seem understand how to use it correctly. The subscription already is pretty expensive, so I can’t imagine buying another one is the way to go and further more the cars informations won’t sync across our accounts then.

Can someone explain to me how this is supposed to work?

Thank you,

Louis