Twin Suzuki 200's EFI Fuel milage??

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I'm looking to see if anyone can help me with fuel milage for these motors. They are on a 255cc seapro. I have a 154 gallon fuel tank. I have made a round trip of about 60 miles so far. And I think I burnt about 50 to 60 gallons of fuel. Does this sound about right? My fuel gauge was showing, alittle over half full when we got back in. I'm trying to find out if I can make trips out to the Navy towers out of Savannah, like R6, R7, and R8. And still be able to troll. Can anyone help please???

[Deleted]

First you need to fill the tanks, then set your odometer on your GPS, run for a while and fill up and record your used fuel and compare to the odometer stored in the GPS. or you can get a fuel flow meter like this.

www.boatersland.com/far-ffm024.html

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Would I need to get two fuel flow meters because I have twins or could I just double the numbers off of one metter??