Even boating is touting fuel efficiency these days. Bombardier's new Evinrude ICON system integrates an electronic shift and throttle control system with their new lines of boat motors, including what they're claiming to be the world's first RPM control system that can be matched to cruising speed. (Somehow that will allow for greater trolling efficiency, although I'm not entire sure how they could maintain a higher speed with lower RPMs.) "PowerSync" allows multiple engines to be controlled with a single throttle lever.
ICON will be factory-installed on a couple of the Evinrude E-TEC engines, while aftermarket control kits will be available for 2008 and later model year engines.