We test the prototype all-electric Audi R8 that's capable of 0-62mph in 4.2sec, with an optimum range of 124 miles and a charging time of less than one hour
New all-wheel-drive RS7 Sportback mixes 552bhp punch of the RS6 with sleek looks of the A7, but rivals like the Porsche Panamera offer a more composed and complete package