I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets....' P6 E# L$ X+ A
5 h+ [6 ?1 H# i7 m! S
For me, I think car-pool is just to share part of gas "cost" and have some fun on road.....: j7 |( X' A: z3 W' ^# P
2 V; e0 h( V; n/ a
I usally charge passager 30 bucks for a trip.