I have a 22' 2001 Bayliner Trophy with a 190hp Merc I/O in it. At 3300 out of 4600rpms,how many miles per gal?

Question

I have a 22' 2001 Bayliner Trophy with a 190hp Merc I/O in it. At 3300 out of 4600rpms,how many miles per gal?

Answer 1

In boating, we talk about GPH Gal.per hour.  This engine uses about 26 gal/hr at WOT (wide open throttle) depending on the load (people,  gear, and fuel) aboard and the prop you are using.  Throttle back to 3200 rpm and you are at about 18 GPH.   Assuming a relatively clean bottom, you should be at about 22 to 25 MPH. (notice I'm not complicating things with Nautical Miles and Knots )  So It's less than 2 Miles per gallon.   Now, if you throttle back to about 2200 you'll be at about 12 GPH  However once you "come off plane, the hull becomes a "displacement" hull.  That means that your "pushing water out of the way" , generally less fuel efficient.

     So, Lighten the load, find the best speed V. fuel consumption rpm,  and enjoy your boat.   I once had a fellow boater who calculated the cost per pound for the fish he caught.....but that another story.

Answer 2

Boats go by gallon per hour.  That can be converted to gallons per mile.  Yes, gallons per mile,  you may burn more fuel than you get in miles.  Enjoy the $4 + gas!

I would install a fuel flow meter to get a better guess.  There is a wide range of possibilities and variables from how much weight your carrying, how its distributed on the boat, what the propellers are, to is the boat hull clean.

Answer 3

A 190 hp 4 stroke engine generally consumes approximately 19 gph at WOT.  GPH fuel consumption is NOT linear it is exponential.  When you reduce the throttle from 4600 to 3300 rpms (approximately 3/4 of WOT) your fuel consumption is CUT IN HALF.  At 3300 rpm you are consuming approximately 9 gph.   Use a GPS (borrow a handheld if you don't have one) to obtain an accurate speed reading at 3300 rpm then divide the speed by 9 to get a close approximation of your miles per gallon at that speed.