Continuing to prove that it can bestow graceful lines and advanced technology on everyday sedans, Ford also brings its green cred into play with the Fusion.A plug-in electric version will claim 100 m.p.g., but even the four-cylinder gasoline engine will get 37 m.p.g. — or you can split the difference with a gas-electric hybrid. Options include a lane minderand park assist. Expected to start at $22,000