F28 Fuel Curve

[Man Cave]

Hi, getting used to my new (old) F28 with twin 225's. Wondering if anyone out there happens to have installed a fuel monitoring system on a twin F28 and could post GPH used per every 500 RPM? I am mostly interested i lower RPM's. I know every boat is different for many reasons (bottom growth, props, coil condition, sea conditions.. etc) but I just want to get a ball park comparison until I get around to installing something myself. Actually if there is knots per hour too that would be great.

Really hoping its less than 5 GPH at 1,000 RPM's.

[The Dog House]

My single Chrysler 225 (318) burns 11 gph at 3000 rpm. Gallons per hour should be dependent on rpm, so you should burn about 22 gph (11 X 2) at 3000 rpm.

[prowlersfish]

5 gph @ 1000 rpm should be no problem . just keep it below hull speed ( about 6.5 knots ) as it take low hp to move at that speed will save fuel . Above that you start pushing water until on plane

[larryeddington]

100 gallon of fuel goes pretty quickly. I have new 75 gal certified tanks designed for the f28 that gives 150 gallon, better and gets rid of galvanized old tanks. New ones are aluminum and built by pt tanks. I have no need for them now.

[Man Cave]

Thanks for the advice, much appreciated.

Replacing the fuel tanks is on my list, which is getting pretty long, of things to chip away at accomplishing.

[pnmudge]

I don't have a flow meter (mechanic talked us out of one when we replaced the fuel tanks), but after 6 years of cruising, I can tell you that we burn about 22 litres (combined, both engines) at 1800 RPM (hull speed is prob around 1500 RPM, but we like the extra knot), and about 50, maybe 55 litres per hour at 3200 RPM.

We mostly cruise at 1800 RPM, giving us about 7.5 - 8.5 knots depending on current, wind, dinghy towing, etc.
We also probably have more spares and equipment on board than would be advisable, so if we lightened the load we might be better off! lol

Sorry for the litres/hour, but we're canadian... it's how we do things