I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets.... ( H( H: {6 k. \5 Q9 x% t* J4 t+ Z5 z
For me, I think car-pool is just to share part of gas "cost" and have some fun on road.....3 o# @/ T7 A9 z) J4 Q
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I usally charge passager 30 bucks for a trip.