I just filled my tank today and my F115 Yamaha averaged 5.9 mpg (19.2 gal and 113 miles). My skiff (23') is light so I don't need alot of hp. It will still top out at 40-42 mph. To me, its a matter of economics, I get to fish alot more for the same cost as my V20 w/ a 150 HP Merc saltwater series on it. The 113 miles represents two fishing trips this week and I'm going again tomorrow. We also have an outstanding Yamaha dealer in our area with a good parts inventory and an excellent service dept.
One thing I don't think anybody mentioned, when repowering with a new motor, you might have spent double what your boat is worth. If you sell in a couple of years, you might take a bath on the sale. If I lived in the north with a short boating season, I don't know if I'd repower with new. That's a lotta money to be setting under a tarp part of the year. Maybe a good topic might be "How many hours did you boat this year". Is the number more or less than last year?
There's no doubt, Etec, Optis, Verados (supercharged) and four strokes are the way to go, if you're looking for modern technology and economy.
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