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My original engine was a 1989 evenrude vro 90. No noticeable difference in fuel economy but the evenrude seemed to have more power / speed and ran smother at idle since it's 4 cylinder vs 3 but no difference cruising. Comparable in terms of noise as I recall. Not sure if it matters but mine is the "inshore series" and I've done 95 % salt water use with no rust but it's garage kept and I have replaced the tilt trim at least one.

Hope that helps.