ow about cruising in hybrid mode at 8 knots without a fill-up for 3,500 nautical miles? Meet the 76-foot Adler Suprema, a tech-filled yacht that could be a game-changer for adventuresome yachtsmen. The builder’s Hybrid Marine System uses a pair of 1,150 hp Caterpillar diesel engines and electric generators to spin the props, achieving speeds up to 30 knots in conventional mode. At 8 knots, those engines sip just 2.1 gph, for nearly 4 nmpg. The Suprema will also run for a full hour at 8.5 knots using just the lithium polymer battery bank (see “Batteries Included,” below) for a vibration- and fume-free harbor cruise or quick island hop. The entire yacht — including air conditioning, music, galley and TVs — will run for 24 hours on batteries alone. To fully recharge the units, once a day, run the twin Caterpillar diesels for one hour. In addition to her hybrid propulsion, the Suprema also is lightweight. An aviation company purchased Adler in 2012 and then invested five years and more than $6 million, drawing on aviation, automotive and yachting technology. The Suprema’s construction includes the use of resin-infused Kevlar and carbon fiber to keep displacement around 98,000 pounds, even with a reinforced collision bulkhead forward and side bulkheads in the engine room. One comparable 76-footer I looked at was about 10 tons heavier.