I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets.... \* D% [9 b6 m* N' {+ x. f0 z* r! d
For me, I think car-pool is just to share part of gas "cost" and have some fun on road..... 3 \" v- E8 o2 U( f/ F ) f: |) f+ Q5 @: n' II usally charge passager 30 bucks for a trip.