I put a merc 150 4 stroke on about 5 years ago, so far so good. I calculate my miles per gallon every fill up. I don t have a fuel gauge, so it s important i know my limits. I can easily get 3.4 and if i really watch it can get 4.3, but thats cruising about 27 mph. I m more comfortable going 30-31 which cuts into the mileage. I need to do some better prop research, i have a aluminum 15 inch 17 pitch and need to try some different ones.
Buddy of mine has same motor on a 20 dusky with a 15.5 inch 17 pitch stainless and he gets 4.5 , but cruises at 28 mph. Also know a few who have gone to 4 blade props and love them.
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