I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets.... * e! U- o6 M' E4 a0 K9 I3 O6 F* I ]+ K! J, j! P% {) H+ t( d) c' \7 c
For me, I think car-pool is just to share part of gas "cost" and have some fun on road..... $ U) m1 e0 q4 X) T' V) t6 G- x& c- l
I usally charge passager 30 bucks for a trip.