I am new to the pontoon world as we just got our 1st one a couple weeks ago. I have been on boats my whole life but never a pontoon until now. As I understand that most are not very fast I am not sure what kind of speed I should be looking to get out of mine. It is a 2008 Bennington 20ft with a 90hp 2 stroke Yamaha. As of right now I am only getting 20 mph per GPS at 6000 rpms with a light load. Does that sound about right?