I had a Floscan on my twin 200hp Grady. True it needed some thumb switch calibration. Once done it was down to a gallon on 253 gallon tank.
The tank is NOT a perfect square so the signal does not tell you gallons of gas left. Only the relative height on the gas tank. Most tanks to accomodate the V in the bilge look like a house on it roof in shape. The paired saddle tanks are not flat on the bottom to conform to hull shape. The only thing that is level is the top of these tanks.
If you're going on a lot of long stuff Flo scan in the way to know gallons burned. DEFINITELY! O/B's trim in the way to max out mileage. MOst O/B run best ( acording to Mfgr curves) around 3500-4000 rpms.. And trim with engines not trim tabs. T-Tabs level by drag. The O/B's & stern drive level by prop thrust. With a GPS you can play with trim and see speeds go up or down without giving it more fuel.
Remember your throttle controls the fuel- NOT the rpms. More RPMS and MPH after trimming at the same throttle position is free miles ( kind of- you still pay for gas).
And of course its not a 50% out and a 50% in. You need reserve for bad seas or delays. And as Gerry pointed out, some gas will never leave the tank. It depends on the tank's pickup tube location.
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Originally Posted by Gerry Zagorski
Couple important things about flow scans.
They usually do take a few fill ups to get dialed in
As I mentioned before you need to know your useable fuel. In other words, your tank is 100 gallons but not all of it is useable. Once you get down to the bottom of the tank, you could have several gallons left that your fuel pick might not be able to reach.
Digital interfaced to a gps is the way to go. The user interface on the gps gives you all the information you will need at a glance. One thing you need to remember here is to make sure and turn your gps on every trip. If not, your range to empty could be off.
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