What size boat are you running? What kind of speed are you getting? I put around 6 hrs on my new merc today. I took it easy on it but seemed to move my 1652 pretty good. Out of the hole did not seem as good as my 2 stroke 40/28 but midrange feels a lot better. I am planning on taking a long run on one of the smaller rivers around home tomorrow to finish breaking it in and see how it does on fuel.