Thanks for the info Ferm. I'm not sure if I have been using nautical miles or statute, that was a good point. I had been running a worn out 19p and my cruising rpms were 3500-4000. The reason that I went to the 21p was to lower my cruising rpms thinking that would increse my mpg's. I will start checking my mileage again and compare.
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1975 V-20 w/1996 225 Johnson
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