To wonder about those specific differentials..............1996 engines, same year V21:
Evinrude 150hp fuel burn at 4,000 rpm.........WOT top speed (41mph) and fuel burn rate.
Evinrude 200hp same
Evinrude 225hp same
Most of us see about 39-42mph top speed with carb'd 150hp outboards.
That lines up well with the Wellcraft spec data.
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