x2 well said
I actually had a preference for the 115hp. Fuel economy for remote trips and lower cost were my personal drivers. Our family has a glass boat for waterskiing so I didn’t need the extra juice.
Some dealers will sell that 175 with less than 115hp, don’t do it! Can’t speak to 18 footers but I might lean to needing more than 115hp.
Oh yeah, I would say 115hp is not enough for a 18′ aluminum boat.
I have an older Tourney Pro, 2004, and it measures 17’11”. The new 185 T-Pros are only 4″ longer at 18’3″. They shrunk when they were re-introduced.
My 175 came with a 115hp and it was under powered. It gained fuel efficiency and top end by bumping up to a 150hp. I imagine that a 175hp would have been even better. Although it may be overkill for the hull design. A friend has a 175hp on a 175 Trophy and agrees with me that these hulls gets a little squirrelly as you pass 45-ish mph. You can start to feel it above 40 and as you approach 50mph it gets more pronounced. It doesn’t really matter though because I’m usually cruising in the mid 30’s.