14-1/4 * 17 3 blade.. I burn roughly 13.5 gph at 4500 rpm which is right at 29-31 mph in calm conditions.. Around 15 gph @27-29 mph offshore loaded. 43-45 mph @ 58-5900 rpm I have a pretty big top and crows nest.. I also run pretty heavy for offshore trips... I love the motor and I'm not that worried about fuel burn but I was hoping for 2.5 or so. 1.9-2.2 is pretty average after about 50 hours of run time... Where are you mounted now and what prop size??