I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets.... 2 h7 S2 M- D: {- y4 ?2 v( y# Z ) A& @5 _% `, L- b" V9 }For me, I think car-pool is just to share part of gas "cost" and have some fun on road..... % ^+ p$ E) C5 u8 \: r1 u 8 [9 O1 J( a8 ^7 u- F% \; OI usally charge passager 30 bucks for a trip.