I don't have a meter, but on my 2003/225pm it gets generally around 4mpg, plus or minus a little. I reset my trip odometer when I fill up just like I do in the car. I have noticed for just cruising around with no real speed, prop doesn't seem to have much of an effect on it. Many times in the summer with people and a rough lake I'll just run my 23 trophy so the motor isn't working as hard back there.