Running a 26.5 Express and I have a performance question. It seem like I have lost some power and I'm not getting the #s I used to.   I have twin 225s F225TXR 4S.  At 4000 rpms, I am cruising at 25mph with a burn rate of 1.5 gph.  The best burn rate I can usually get is 1.5 - 1.6, but it's...