I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets....0 M6 \3 S R; n3 e3 z: A
; Z- p( n0 [9 [For me, I think car-pool is just to share part of gas "cost" and have some fun on road..... 5 L. X- s7 f% f ( q D" F) p/ O* Z" W5 i% SI usally charge passager 30 bucks for a trip.