A few late model CNG Impalas have been spotted testing in Colorado. Hopefully this is a good sign that a factory produced CNG Impala is on the way in the next year or two. It seems like Chevrolet finally had the CNG system figured out with the 2003-4 Cavaliers, but then stopped making them. Hopefully Chevy can do the CNG Impala right.
Read the full article and see more pictures here: http://www.autoblog.com/2013/05/20/is-chevrolet-readying-a-cng-powered-impala/