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[quote user="gardendance"]That's why proposals have a 'do nothing' scencario. Despite carpooling your gas bill did not decrease, but what would have happened to your gas bill if you hadn't carpooled?[/quote]If you have three people drive in one car, as opposed to driving individuallyin three cars, the amount of gasoline burned goes down for that portion of the trip where two of the drivers park their car and join in the car pool.  If the price of the gasoline increases, the reduction in the volume consumed is can be offset partially or completely by a price increase.  In addition, depending on the size the the vehicle, the added weight may reduce the miles per gallon.  And the driver may see an increase in his maintenance costs and insurance rates because he is hauling people to work, assuming that is where he is going, as opposed to driving solo.  This is what has happened to Amtrak.  It is hauling more passengers with a slightly lower fuel burn per train mile and by implication per passenger.  But the cost of the fuel has rising dramatically, thereby offseting the reduction in volume.  In addition, most of the other costs associated with train operations have risen, some nearly as much as the fuel, thereby negating the gap between revenues and costs that one would have otherwise expected to widen.  At the end of the day one needs to look at all the costs.
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