THE PICK-UP VOLT:

General Motors and Chrysler Group are about to start selling full-size pickups that can seamlessly switch back and forth between natural gas and gasoline. [...]

The cost savings of using CNG instead of gasoline is marked. The amount of CNG that is equivalent to a gallon of gasoline now sells for between $1.50 to $2 less than a gallon of regular gasoline. And with growing and abundant supplies cutting natural gas prices, coupled with rising gasoline prices, that gap could grow even larger in the years ahead, saving drivers using CNG thousands of dollars a year. (Watch: How to spend less on gas)

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