Opposite to what was, or might naturally be, expected

Near the end of this (rather lengthy) post, I described my car as driving on the green mile, because of the problems with my car that mean it is very likely destined for the scrap yard within the next two years. In particular, the car is certified environmentally unfriendly.

While preparing the post, I googled the phrase "driving on the green mile". To my surprise, among the hits that were not about Stephen King's movie, there was a site referring to Ford's commitment to produce cars that are more environmentally friendly, and later on there is another referring to Mercedes doing the same.