just forget efi conversion for mpg
It CAN be done but isn't worth the headache
if a car gets 20 mpg climbing a steep grade with a well tuned carb and 21 with efi then you have gained 5%
if a carbed boat gets 3 mpg and you gain 5% you end up getting 3.15 mpg
also where efi really shines is by leaning the mixture for low throttle highway cruising... boats NEVER do that because they are ALWAYS going uphill when planing.
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