Cadillac Ciel

Last night at an event before the Pebble Beach Concours d'Elegance in Carmel, Cailfornia, Cadillac unveiled its Ciel concept car, which it calls "an open-air grand touring car." Under the sleek, imposing lines, the all-wheel-drive Ciel four-seat convertible is powered by a 425-horsepower, 3.6-liter V-6 engine with twin turbochargers. That engine, says GM, is paired with a hybrid system that uses a lithium-ion battery pack. So far, so good. Another General Motors concept with a hybrid powertrain. But what is it, exactly? 'Hybrid' sans details The first thing to note is that GM has released...