I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets....* l+ e& l% I* \7 a- \0 f9 ?
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For me, I think car-pool is just to share part of gas "cost" and have some fun on road.....1 e! E6 @: o+ h5 B/ I1 s
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I usally charge passager 30 bucks for a trip.