Whatever Happened to CNG-Powered Cars?

It’s interesting to speculate about why solutions that would have actually worked – which did work –  seem to always just kind of .  . .   go away. 

Not the fabled 100 MPG carburetor. That probably never existed.

But how about cars powered by compressed natural gas (CNG)?

They did exist. And – much more interesting – they worked. 

Several car companies – including GM and Ford  – offered them, briefly, back in the late 1990s. Including CNG-powered versions of their full-size sedans (the Impala...