I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets....5 y1 n0 k4 Y' s0 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.....0 L: l3 `5 p% t( W) D9 R
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I usally charge passager 30 bucks for a trip.