I do know one CEGer who got the CNG car & removed the CNG system because the storage tank was missing anyway.
I don't expect they'll be any less reliable than any Zetec Contour - which is pretty darn good actually. I think you have to run a tank of gasoline for every 3 or 4 tanks of CNG, just to keep things lubed up.
Now the Cav, I wouldn't touch. Friends had two. Replaced trannies twice in both of them. They were not nearly as fun to drive, & frankly I have concerns about their safety, but that was just my perception - may not be a real concern. Really bad in my limited experience.
One former CEGer in the SE does have a Cav & he likes it IIRC, but I don't know how his car has been doing.
There is a green CNG Contour for sale on Ebay in VA or sup'm. Finding a place to fill it will be fun... but I think you can buy a CNG pump for your home that will fill the tank overnight.
