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410 Sport Sedan 8.1 Horizon performance question


Hello everyone I'm wondering if anyone has specific experience with a 410 Sport Sedan with 8.1's to provide some baseline data for me to compare to. I've seen numbers suggesting 17-18 knots for best cruise and 26 knots WOT. With fuel burn around 1.5 gallons per mile. I'm finding 18 knots feels solid and smooth but I'm only getting. .39 Nautical Miles Per Gallon which seems excessive even for this behemoth and half what it was speed at.... Engines run great. I have recently installed Fox engine gateways and have included the outputs while running 4k rpms.
Loving the boat but don't hate money so if I'm wasting a bunch I'd love to sort that out early on.
Screenshot_20210703-071318_Fox Marine.jpg
Screenshot_20210703-071355_Fox Marine.jpg

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