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Boston Whaler has now added performance tables for the larger 115 hp Merc Fourstroke/CT engine option.

The 90 hp Merc Fourstroke/CT does somewhat better on fuel economy at slow displacement speeds, but the 115 actually does better and has a greater range at mid-range planing speeds.

The 115 has the boat up on plane doing 16.3 mph at 3000, whereas the 90 only has it at 11.1 mph (at 3250 rpm, the 90 hops up on plane.) The 115 yields a top speed of 46.0 vs 40.0 for the 90.

It sure seems like the 115/CT engine is a worthwhile option for this new Montauk model. However, it's a $990 option!