With its prototype series of Astro concept cars, GM showed drivers a possible vision of a future that never fully arrived.

Firebird II and III followed, all designed to test the viability of gas-turbine technology for road cars. This concept car was designed by Bill Mitchell, another legendary GM auto designer.

Built by Vince Granatelli, son of Indy 500 guru Andy Granatelli, this curious Corvette came into being by cramming a Pratt & Whitney ST6N-74 gas turbine engine into the donor car's lengthy front end.

Velozzi does plan to produce the plug-in hybrid sports car we showed, but the concept referred to in the video was actually developed by Capstone, a micro-turbine manufacturer. That car, dubbed ...

GM sold vehicles at an average price of $50,000 U.S. for the year, and executives see a 1 per cent to 1.5 per cent drop in North American pricing power and a modest decline in gas-powered vehicle ...