For me it was just a matter of adding an additional 21 gallons in two above deck tanks (15 and 6) that fit perfectly under the bench seat out of the way.
It does add additional weight in the rear, so I burn off the 15 gallons first. Gets me out close to 40 miles before I switch over to the main tank.
I agree with the 4 stroke logic though. If you get 4 mpg then you should be able to do 150+ miles and finish with the 20 (1/3 rule).
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1994 Wellcraft V21
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