I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets..../ l" y: q% R6 |* Z" O. m
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For me, I think car-pool is just to share part of gas "cost" and have some fun on road.....3 \6 c! ?2 C8 m9 J! b/ v! R g
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I usally charge passager 30 bucks for a trip.