Personal car sharing and peer to peer car sharing pertain to individually owned cars Thus the distinction here is based more on the ownership of the vehicle rather than the time of rental  This is a niche under the topic car sharing Car sharing encompasses all forms of car sharing BB and PP car sharing The public needs to be able to distinguish between BB and PP car sharing as it is a distinction that people understand and for which they are searching for in search engines Therefore whatever title distinguishes between BB and PP car sharing would be appropriate eg personal car sharing or peer to peer car sharing or neighbor to neighbor car sharing or friend to friend car sharing etc