Well my buddy bought a 2000 sylvan 17.5ft with a Yamaha 70hp, and all the goodies on it, trolling motor, kicker, livewells,3 batteries, tons of storage filled up, with 3 people on board and it does about 45mph. It totally rips compared to my very light 16ft with a 50hp on it. It barely does 30 when loaded right. BUT we ski and tube behind it, so if that's any measure of power, I'm sure a 90 will make you smile.