[Wonder Warthog]

"If I could find a place to refill, I’d switch my rig to CNG today. We have one refueling station in the entire state (Billings, MT)"

And there you have the problem with CNG....lack of infrastructure. It is either going to take a law and/or a subsidy to get gas stations to include CNG fuel-up points.

[thackney]

I am guessing home refueling units will build the market first. Then after there are more vehicles, CNG commercial stations will be economic.