I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets....; S2 p- @& u' y8 L
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For me, I think car-pool is just to share part of gas "cost" and have some fun on road..... : ]( @7 N, S! s8 S2 `$ b8 i1 D& q' r * ^3 d7 U1 e1 n/ b2 XI usally charge passager 30 bucks for a trip.