Audi A5 Sportback g-tron: first drive of natural-gas luxury sport sedan

2017 Audi A5 Sportback g-tron (European model), driven, Aug 2017  [photo: Ronan Glon]Audi’s vision of future mobility primarily centers around an array of long-range electric cars scheduled to debut in the coming years under the "e-tron" badge. These are intended to be Tesla killers, as they’re often called in Germany. But there’s another kind of tron with a “made in Germany” label as well, and...