I have a 1998 Stratos with a 150 Faststrike 18' long My boat runs within 100 rpm's of the speed does not appear to lug comes out of the hole good. Don't know what wide open is as don't want to run that fast but have ran at 50 mph and it runs 5000 rpm's at 50 mph. What got me on this is my Son-law has a 2006 Stratos with a 150 Johnson 19' long his boat runs 40mph at 5000 rpm's. I don't know the pitches but both are four blade stainless. Just wanting to know the correct ratio or rule of thumb as to RPM to Mph. I have heard of over pitch and under pitch. I know boat weight will affect this. I know some want to come out the hole faster and some want the top end. I am just wanting to know the best ratio is as per Mph vs Rpm. Cub48