Washington State clean vehicle tax exemption to expire May 31

DC Fast-Charging Stations in Oregon and Washington states, January 2015 [map: PlugShare.com]The hotbed of electric cars so far has been the U.S. West Coast. California, of course, is the leader, with its zero-emissions vehicle mandates. Going up the coast, the selection—and sales—get steadily thinner, but remain conspicuous. Now the Evergreen State, which has a strong electric-car presence even though it does not follow...