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Could it do it on fuel that costs 1/3 less than gasoline?

No it could it not. I didn't realize CNG had that kind of costs savings on a doller per mile traveled basis.

No it could it not. I didn't realize CNG had that kind of costs savings on a doller per mile traveled basis.

Yup. The nice thing is that the CNG stations price the fuel in GGE (gasoline gallon equivalent). It is not like E85, where you pay 25 cents less but get a 20% hit on your mileage. The comparison is apples to apples. The main downside is that a tank of CNG holds fewer BTUs/calories/joules than the same sized gas tank.Also, the tanks themselves, and some of the pieces to deliver the fuel to the engine cost more. Modern car computers fdefinitely make the bi-fuel approach more pracical.

The chicken/egg problem is being solved by the truckers, as major truck stop companies are starting to install the pumps nationally. For consumer vehicles, we have some pick-up trucks and the Honda Civic. We definitely need a minivan, SUV and large sedan option available from a good manufacturer. Ford is going in at least for the trcuks, cars might be next.