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Ok, so here it goes. I just finally got to test the 2.1 l mercury 90 on my 1992 17' Montauk & what a world of difference. I Wasnt really paying attention too much the mph in all the midrange rpm's. Let me start off by saying the top speed on my old Yamaha 90 2 stroke was about 36 mph & with a light load about 37-38mph. The new motor topped out at 46.2 mph at 5350 rpms on my gps with me , the wife & about 10 gal of fuel .At that speed it starts to chine walk side to side pretty bad to the point of scary. The motor should push a few more rpms than 5350, but that's all I could get out of it. Also at midrange its very smooth in all the rpms but in the high 20's to low 30's it tends to porpoise quite a bit till you get the trim set just right. then its smooth sailing. My dealer said I would probably need a motor height adjustment, and a prop change to dial it in & get the rpms. Not really sure I want or need the x-tra rpms. The hole shot was also quite superior to the old 2 stroke. Im not sure what the hp difference is between the old Yamaha 90 & the Merc 90, but to gain 8-9mph top end on the new motor im guessing its more than 90 hp to the prop! So, with the right prop & motor height adjusting, & right amount of trim im sure 48-50 mph is not out of the question. Needless to say you will not be catching me going that fast very often in my 17' whaler. Just no need for it really...but the power is there! If anybody has any questions feel free to ask.