I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets....% M7 q8 P2 n! m+ ?1 d8 I/ a
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For me, I think car-pool is just to share part of gas "cost" and have some fun on road..... ; T) E5 P( W8 o1 N) k* w , a3 \* `$ L ~4 cI usally charge passager 30 bucks for a trip.