With all the buzz around efforts to make cars and planes more fuel efficient, it’s easy to forget that boats have a lot of room for improvement as well.

On April 11, at the premiere of the Sea Air Space show in Maryland, a tech firm named Zyvex Technologies drove that very point home when they unveiled the Piranha, an unmanned vessel that’s 400 percent more fuel efficient than similar models.

Developers achieved the record-breaking milestone after subjecting it to a 600-mile test across a stretch of the Pacific Ocean near Puget Sound, where the boat reached a cruising speed of 25 knots while using 12 gallons of fuel per hour. A similar boat traveling at the same speed would have completed the course while consuming at least 50 gallons of fuel per hour.