I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets....5 B# r9 O, p) }% [; C" b
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For me, I think car-pool is just to share part of gas "cost" and have some fun on road..... 5 m- D9 Q6 T$ z- u1 z! ?' e( x" l5 N p1 Z; A
I usally charge passager 30 bucks for a trip.