I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets.... : q# J6 O8 N! H1 A. p6 @6 Q; ^$ D6 _
For me, I think car-pool is just to share part of gas "cost" and have some fun on road..... 4 v5 |3 x' h0 }, J3 j- t6 f& C # B3 j+ s/ e5 G/ NI usally charge passager 30 bucks for a trip.