I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets....$ _: {2 F( H. M' x2 O
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For me, I think car-pool is just to share part of gas "cost" and have some fun on road.....6 s2 U) r! E& N. C% Z# M" W
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I usally charge passager 30 bucks for a trip.