I've got Franks old boat. The 90 works really well. We go out regularly loaded heavy in bumpy seas. I don't have a flow scan but would say we get around 3 mpg, with a 17p black max prop. The motor needs to be raised a couple inches and will do quite a bit better then. I would say if the 115 is the same weight and close to the same HP, get it. Otherwise the 90 will be just fine and probably burn less fuel.
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