On my '91, 25' old style bracketed Contender, I went from twin 25" 150 Yamaha Hpdis to a single 30" 225 Yammie 4 stroke. Fuel economy went from 1.6-1.8 to 2.2-2.6 mpg, depending on load and sea conditions. The boat is more sensitive to weight and seas compared to before.
Eventually will upgrade to a 300 hp. You should see close to 3.0 mpg in average conditions.
I have a twin engine Stainless Marine, which I did not move.
Mounted the engine at the highest setting, but it could still go up a few more inches; needs a small porta bracket or similar.
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