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I have installed a Navman 4380 on a 22' Aquasport with a 150 Yammy. took it out yesterday and calibrated. It says at 4100 rpm 30 mph in the ICW that I am using 3.78 gph. At wot it says 6.80 gph. Does this sound right??

This is a 2003 motor and boat. With 56 hours
 
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