I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets....! E; l+ z5 \ e0 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..... 0 c* D/ S$ H( G& G' f% n | 0 g6 K' k! p* F" p% ^I usally charge passager 30 bucks for a trip.