I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets....4 Q$ ~3 G+ \0 S
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For me, I think car-pool is just to share part of gas "cost" and have some fun on road..... : v7 k7 D$ H+ u" d) g7 |8 F: E; |; T# n* K! r& x2 l5 z
I usally charge passager 30 bucks for a trip.