I have the Yam 200HPDI on a 22' Nauticstar and I get under 3MPG, but I run it harder than I should.

1960 BB Yamaha 150 Carb... 4500 rpm equals 40 MPH which equals 3-3.5 MPG.

Z2200 SW, Yamaha VMAX 225 Hpdi 21p mercury rev 4, 4800rpm 50.5mph 3.0mpg that's what I like to cruise at! Gets about 2.0 @ wot 5800 60mph
3600rpm 39mph 3.8mpg.
Now oil is another story! 3/4's of a gallon every 60miles!

That 175 Zuk is crazy!! That's awesome

2001 Yamaha 150 2-stroke on a 19' Deep-V Mako. I still have the oil reservoir/injector installed. I don't blend it myself.

70-80 miles per trip (offshore) running ~25mph.

Fuel soncumption is heavily dependent on whether the seas are calm or rough.

25-30 gallons / trip in calm seas.

35-40 gallons / trip if the seas are rough.

3/4 gallon of oil.

It's not just the 175, I ran a crew boat with twin 140's that's was stupid good on fuel!

12 gph running 40mph at about 3800 rpm. That's with a 300x merc

only time I keep track is when I go off shore. 200 yammy 2 stroke. 2 mpg. but I never turn the motor off when I'm out there

I run a 150 HPDI on my nautic star but have never figured out my fuel consumption. However I was on a 32' Regulator w/ twin 300 Hpdi's and at 4000 rpm's we were getting .8 mpg's. Keep in mind that we were loaded down w/ ice (about 800lbs) and 400 gallons of fuel. On the ride back we were averaging 1 mpg. Also burnt about 12 gallons of oil on the 230 mile round trip. I could almost see dollar bill churning in the prop wash. LOL

Im not getting quite the speed at cruise he is getting but the mileage is basically the same.

175 zuke on a Frontier 2104

I get right at a 4 mpg at 37- 40mph. @ 4700-4900 rpms with my xpress x22 bay boat with my 150 4 stroke yamaha.....3 peeps with gear and stuff.