I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets.... & G9 X/ {* \& B3 p- @' d5 O$ @# K6 m
For me, I think car-pool is just to share part of gas "cost" and have some fun on road..... * q4 F0 A, \) s e+ E' u * f* ]7 @5 d; J3 L) iI usally charge passager 30 bucks for a trip.