The Mercury 115 EFI four-stroke outboard is an in-line 4-cylinder that is made from the same 1.7 liter block and powerhead used in the 200-hp Verado. Many other components from its beefy big brother is used as well. The difference is that the 115 is not supercharged. But if it were, its block and head could handle the tremendous energy produced in those engines with almost twice as much power. We have all read enough engine-maker promos to know that they all say their engines are durable, but here is a case in point that is hard to deny. But that heavy-duty power head is only one of the things that the Mercury 115 has going for it.