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Here’s how 20 popular EVs fared in cold-weather testing in Norway

Electric vehicles are known to suffer diminished performance in cold weather, but some do a better job than others hanging onto their range capacity while cabin heaters and frigid outdoor temperatures sap power from their batteries. Recently, the Norwegian Automobile Federation put the 20 of the best-selling battery-electric vehicles in the country to the test, to see not only how winter weather affected their range but also their charging times. The major findings: On average, electric vehicles lost 18.5% of their official driving range as determined by the European WLTP cycle. Electric vehicles also charge more slowly in cold temperatures. And interestingly, the researchers learned that EVs don’t simply shut down when they lose power but instead deliver a series of warnings to the driver, with driving comfort and speed levels maintained until the very last few miles. Because itÂ’s Norway, the worldÂ’s top market for electric and plug-in hybrid vehicles by market share, the test included many EVs that arenÂ’t available here in the U.S. But there are many familiar faces, among them the Nissan Leaf, Tesla Models S, 3 and X, Hyundai Kona (known here as the Kona Electric) and Ioniq, and Audi E-Tron. In terms of range, the top-performing EV was the Hyundai Kona, which lost only 9% of its official range, which the WTLP rated at 449 kilometers, or 279 miles, compared to its EPA-rated range of 258 miles on a full charge. It delivered 405 km, just enough to nudge it ahead of the Tesla Model 3, which returned 404 km. Other top performers included the Audi E-Tron, in both its 50 Quattro (13% lower range) and higher-powered 55 Quattro (14% lower) guises; the Hyundai Ioniq (10% lower); and Volkswagen e-Golf (11% lower). At 610 km (379 miles) the Tesla Model S has the longest WLTP range of all models tested and went the furthest, but still lost 23% of its range, though it also encountered energy-sapping heavy snow at the end of its test, when many cars had dropped out. The Model 3 lost 28% of its range. The worst performer? That goes to the Opel Ampera-e, better known stateside as the Chevrolet Bolt. It traveled 297 km (about 184 miles) in the test, which was nearly 30% lower than its stated WLTP range. We should also note that Opel, now owned by Groupe PSA, is phasing the car out in Europe and that Chevy recently upgraded the Bolt here in the U.S.

Mercedes previews new S-Class convertible

Mercedes keeps on expanding its flagship S-Class with more models, and will soon add one more to the roster. But before it does, it's giving us this teaser of what's to come with an advanced look at the upcoming new S-Class Cabriolet. The convertible model will be based closely on the S-Class Coupe we already know, only with a folding roof. Expect that dropping top to be constructed of several layers of fabric (as opposed to a folding metal top) with a glass rear window (instead of plastic) to keep it luxuriously isolated and insulated from the outside world when it's up, and let the wind and sunshine in when down. The Cabrio will bring the array of body-styles in the S-Class range up to six, with the convertible joining the existing coupe and four wheelbase lengths of sedan. Expect powertrain options to closely mirror those of the coupe, including S550, S63, and eventual S65 AMG models driving the rear wheels or all four. Slotting in above the E-Class Cabriolet, the new convertible S-Class will be Daimler's "first luxury four seater cabriolet since 1971." It'll compete in rather rare company against the likes of the Bentley Continental GTC, Aston Martin DB9 Volante, Maserati GranTurismo Convertible, and even the upcoming new Rolls-Royce Dawn when it arrives. And judging from the timing of this preview rendering's release, we anticipate it'll arrive soon. Related Video:

Mercedes-Benz Vision Tokyo concept shows us our lazy future

The first autonomous vehicles to hit the road will likely look much the same as the ones we drive currently. But as self-driving technology evolves, so too will the shape of the vehicles themselves. And this is what Mercedes figures that future could look like. The Vision Tokyo concept, so named for the show now ongoing at which it's been unveiled this morning, is an odd yet forward-looking shape, rendered in Alubeam silver and glowing blue. Power comes from a hybrid hydrogen fuel cell and inductive electric charging system that give it a theoretical zero-emissions range of over 600 miles. One look at the lozenge-like shape should tell you that the design is all about the interior space. The driving station – should it be needed – offers a clean dashboard with HUD-only instruments and a central driving position with unobstructed view through the wraparound windscreen. The cabin is clearly focused, however, on the lounging occupants more than on the driver. Accessed via a single, giant gullwing hangar door, the approach is closer to that of a mobile lounge space than a traditional automotive interior, with a wraparound sofa, some manner of high-tech 3D game projected in the middle, and a wide infotainment screen on the inside of the door. The concept clearly foretells of a different future – one that demands less of the driver and offers more relaxed comfort. So while the driver within us grows concerned at his numbered days, the rest can't help but be strangely intrigued. Scope out the live images from the floor of the Tokyo Motor Show and share your thoughts on the concept in the Comments section below.