I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets....5 `5 \9 c1 W9 o3 n$ h [4 n$ I* Q
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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; p* P! I5 G3 I# R4 g4 O8 C9 R/ {5 n
I usally charge passager 30 bucks for a trip.