The 273-foot Feadship-built yacht Savannah could set a new superyacht standard for fuel efficiency, not to mention intrepid design. While many superyachts claim to be eco-friendly, Savannah features a design that is truly groundbreaking, both it terms of naval architecture and propulsion.

The yacht’s unmistakable profile, including its knife-edged vertical bow and so-called “floating superstructure,” promises to be a head-turner anywhere it travels. Savannah’s dramatic topside design is complemented by an i…