DEARBORN, MICH. (Sept. 27, 5:30 p.m. ET) — Ford Motor Co. has found that efficiency comes at a price. Noise. When engineers for the Dearborn-based automaker tuned the engine for Ford’s new 2013 Fusion hybrid sedan to get the most miles out of each gallon, the engine produced what the carmaker termed "unpleasant powertrain sounds." So to keep the efficiency without annoying drivers and their passengers, Ford is equipping the Fusion with "active noise-cancellation technology."