The 115hp would have been the engine of choice but the deal I got on the 90 made it attractive temporarily. The 115hp is the same weight and physical size as the 90hp just a bit more powerful. I bought and fitted the 90 thinking I could probably sell it for what i paid for it next year and by then have the balance to upgrade.
Looking at the pictures it does look OK, just getting used to it as the Assault had a low bow and rode very flat, one of the reasons it was rather wet in anything other than a flat calm.........
We were flat out at times doing coming down river using 0.9l per Nm, cutting back to cruising speed around 26-27 knots we use around 0.7-0.8l per Nm so our consumption wasn't too bad after all !
The boat is fairly heavy with twin batteries and 88l of fuel plus lots of chain and anchor but you have more people on board and your boat is longer which probably makes the difference in fuel usage.
I have just recalled that the rating on the boat is 130hp, forgot that lots of hulls have been derated because of the weight of equivalent 4 strokers being heavier. The identical 1990's 5.8m destroyer I used years ago had a 150hp 2 stroke on it and was fine with it as far as ratings went and boy did that thing shift when it was empty of divers!