The premier premium vehicles of today certainly serve up an incredible array of exotic materials and royal comforts, but they’ve also become well known for their leading-edge technologies, including those behind the best fuel-efficient luxury cars. Indeed, the latest top choices offer all-electric, plug-in hybrid and hybrid powertrains, and while they just missed the cut-off here, a number of diesel-powered entries can enable surprisingly high EPA scores as well. Speaking of which, all of these vehicles but one provide combined fuel-economy ratings of at least 30 mpg, with the one that doesn’t nonetheless able to deliver a double-digit all-electric driving range. All of them do deliver on the luxury front, however, complete with advanced connectivity features and a comprehensive portfolio of passenger-protection measures.