Audi’s flagship limo is all-new for 2018, literally – it has a new platform and new engines, plus a couple of firsts for the brand. Basically, every model in the lineup is now a hybrid – from the entry-level 3.0-liter TFSI and TDI motors to the upcoming W12 range-topper. The mild hybrid system, regardless of the engine choice, can let the A8 coast for up to 40 seconds without the engine engaged, at speeds from 34 to 99 mph (55 to 159 kph), to save fuel.