I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets....' K; e! f; k# ]
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For me, I think car-pool is just to share part of gas "cost" and have some fun on road.....0 a1 B, N& f( b1 x) O" D; y
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I usally charge passager 30 bucks for a trip.