I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets....9 B3 _! h# f. l
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For me, I think car-pool is just to share part of gas "cost" and have some fun on road..... . |" U, C+ h& H2 s# U E8 I! }7 D* b
I usally charge passager 30 bucks for a trip.