I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets....! T- H% G# e& Y; i% E3 c( P
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For me, I think car-pool is just to share part of gas "cost" and have some fun on road..... 8 L% N0 h7 J! Q- l. D H, x9 |$ }% N1 E5 H0 v4 x9 ZI usally charge passager 30 bucks for a trip.