Luxury cars are expected to be silent and powerful. Electric cars deliver that. Gasoline powered vehicles eliminate the worry of being stranded far from a charging station. Plug-in hybrids like the BMW 745e offer the best of both worlds- silent electric oomph and no range anxiety at all. What’s the all-electric range? How powerful is it? Is the price too high to appeal to wealthy buyers? Tom Voelk answers all of these questions and more.