I get around 5mpg at 22-25 mph with my Johnzuki 140 4 stroke...but I only have a 40 gallon tank so my range is not what it could be with a 60 gallon tank.
I have never even come close to running out, infact, I often go 2 or 3 days without gassing up.
My motor weighs 410 pounds, it doesn't seem any different than the 150 Merc that was on it when I got the boat.
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Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke.
1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.
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