"A good estimate of fuel consu
"A good estimate of fuel consumption is about 1 GPH per 10 propshaft horsepower.
So if your engine is rated at 260 hp, it should burn about 26 GPH at WOT.
If you are cruising at 3500 RPM, and assuming that hp is roughly proportional to engine RPM, you are making about 3500/5000 X 260=182 hp; and your fuel burn should be around 18 GPH. Pretty nasty, isn't it? And this is steady cruising. If you are stopping and starting like when pulling skiiers and the like, it is much much worse.
There is nothing very economical about pushing a boat through the water.
Rod"