New-to-me boat (24 Sea Sport XL) came with 13 3/4 x 17 props on the twin Yamaha 150's. Worked great for me, I run them at 4000-4200, getting 27-30mph depending on seas and load, and 12.5-14.5 gph, also depending on load and seas. WOT I was able to get them up to max of 5400-5600 rpm. Talking with Buzz at Deweys and he said I needed a small prop to get RPM's up. Ok, I bit, and his shop sold me 14 1/2 x 15 Reliance props, which were crazy spendy. Two trips out now and I couldn't be more disappointed. Max RPM's didn't change, in fact on starboard engine they actually dropped. Engines are less fuel efficient now, I'm burning about 1.5-2 gph more than before. I do get a quicker hole shot, but that was never the issue or goal. So less max RPM and worse fuel economy ~ for $1,200 price tag! What am I missing here?? Their shop is closed today but will be bringing them back tomorrow for a chat. Also, I thought I was buying stainless props, after two quick trips here is what they look like. I can't believe this is "normal".