I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets.... . r2 _/ } ]0 Z* U6 k . p m6 K$ @$ lFor me, I think car-pool is just to share part of gas "cost" and have some fun on road..... . L; T* x1 {- C! X) L " {! ]% }8 G! l0 _I usally charge passager 30 bucks for a trip.