How much fuel does a 190 hp mercury mercruiser burn in 18ft boat?

Question

How much fuel does a 190 hp mercury mercruiser burn in 18ft boat?

Answer 1

You should average about 5-7 gph

Answer 2

A rule of thumb for computing fuel consumption on any gasoline powered boat engine is to divide the total horsepower (hp) by 10 if the engine has a carburetor . The result will yield a close approximation to the Gallons per hour (Gph) consumed by that engine at wide open throttle (WOT).   So, 190 divided by 10 yields approximately 19 Gph consumed at WOT for  a 190 hp engine.

If fuel injected the formula is similar, but  you divide the hp by 11.  So, 190/11 = 17.27 Gph at WOT.

Another rule of thumb is that the fuel consumption for any engine at 3/4 throttle is approximately 1/2 the fuel consumption at WOT.  So, if your 190 hp has a carb and assuming WOT is 4400 rpm,   you would consume approximately 9.5 Gph at 3300 rpm.

Answer 3

it depends on the boat   and  prop you have to get the boat on plane that is where you get the best so called mpg if you have a tri-hull or a displacement hull a lot of fuel . go fast get the boat on plane and pull back the throtleslowly to keep the boat on plane you will get the most out of it

Answer 4

Depends on a lot of things.

RPM's is the biggie.

So does WOT.

If you are waterskiing all day a tank of gas per day is not out of the question. Have done it many times.

If you are out cruising around, and please let me recommend staying below 80% WOT it might take a couple of days to burn a tank.

Going slow, cocktail cruising, less than 1500 rpms, you will have plenty of gas for days.

Edit: Josh, that is excellent, gonna write that one down.