I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets.... : O% d5 R) |# H; F( T2 r; C$ E( M2 Q. T$ G
For me, I think car-pool is just to share part of gas "cost" and have some fun on road.....; q( A `1 a+ m% O0 m) _! z
6 W( u* J5 t+ E! TI usally charge passager 30 bucks for a trip.