Quote:
Originally Posted by jrc
You really need an fuel flow meter to monitor in real time. Say I want to boat over to Wolfeboro, what is best speed to go there. The very best speed will be around 5 MPH but that's four hours round trip. What's the best on-plane speed? I don't have the equipment, but I can guess it's better at 25 MPH than at 12 MPH. But my GPH will be better at 12 MPH.
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You're correct, but then you still have to do the final math...
Let's say at 5MPH you're burning 2GPH. To go 25 miles would take 5 hours. Hours x 2GPH would be 10 Gallons burned to make the trip.
At 25MPH you might be burning 9GPH. To go 25 miles would take 1 hour and you'd burn 9 gallons (making better time and less fuel than the 5MPH ride).
At 12MPH you might burn 6GPH. A 25 mile ride would take a little over 2 hours and 12 gallons.
(These are all just made-up numbers, but hopefully you get the idea).
You have to factor GPH, and time/distance.