I have a 23 Tahoe t 18 and so far have gotten up to 40 with five adults and two small kids. That not pushing it . It can do more. Water conditions make a difference
Really need to know what prop and if she’s a CT or normal model. I’ve a 115 CT mariners version. It’s on a 19ft deep narrow v cuddy. I run a 19” tempest or a 20” enertia on it. Will see 43 and 45 mph gps respectively.