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"A 20-pound propane bottle will power the engine for about 50 hours, or roughly the same run time as a conventional outboard and 5-gallon tank. ... Notes Lehr founder and CEO, Capt. Bernardo Herzer, the engines will cost you about half as much to run as a gasoline-powered outboard because propane is less expensive than gas."
Obviously this is technology from Area51, because a "20" pound propane bottle is usually filled to something like 17 pounds now that the "new" safety valves are in them all. And at something like $20 per fill, that would make them dollar for dollar even with a five gallon gasoline fill at $4/gallon, which is marina pricing not road pricing. yet.
Burning cleaner, yes. No degunking, yes. Handy for a lake boat when you've already got two 20# bottles on the deck for your grill. But this is the first time I've heard the fuel densityof propane and gasoline are the same, I'd expect a 20# propane bottle to last only half as long as a five gallon gasoline tank.