I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets.... * X2 G) k9 @& R* I6 R1 V% V - ~9 Q) L8 T, ?; K4 ]For me, I think car-pool is just to share part of gas "cost" and have some fun on road..... / j8 [' ?5 }$ z( V 1 f6 l5 M1 I$ o, R' o3 e; JI usally charge passager 30 bucks for a trip.