Diesel engines last longer, too, because they are equipped with standard freshwater cooling systems, which ensure proper engine temperatures and reduce internal corrosion. (For $2,800 you can equip the gas engines with FWC and negate some of the diesels' price increase in the process.) Also, to reach efficient cruising speeds, you can run diesels at lower rpm than gas engines. By operating an engine at a lower rpm, all of its moving parts - pistons, rods, crankshafts - move through fewer cycles, resulting in less wear and tear. That, and the fact that diesels are built heavier to withstand the higher compressive forces they generate, is why they last longer. Sure, if you're a dock potato who rarely cruises and wants the room and comfort of a sedan to entertain your friends, none of these statistics matter much. Choose the less-expensive, standard gasoline inboards and party on.