Nice numbers mid range looks look for those sloppy days ..... what prop are you running ?
14.5 x 17 Enertia. Started with a 19 and got scared at 83 kph / 45 knots (for Ranmar!) so never really got a good read for top end but wasn't pulling enough revs.
From the second to third pic the fuel drops 20ltr in two minutes? Maybe hit a wake or something
I believe the gauge is wired to the tank float so yes it notices the boat moving. I've been trying to take note of the total litres at the start and end of the day when its on the trailer and it seems pretty close to what I reckon the burn should be.