That is exactly the number I reach

Loaded down with all the options, and fuel and water, I see 70-72. Best was 73 and change in good chop, no water, and on fumes.

I have 00 353 with 454 cams and hp500 heads 75gps on a good day

75-76 loaded options, saltwater and extension boxes on XZ drives and Bravo 28P.............don't have the same set up now but it's faster.

I have a 382 with an F2 Kevlar hull, with a full interior. (one of a very few built that way). Running 500's with Stelling boxes, 82-83 with Lab B1 29's at 5400 rpms. 80-82 at 5200 rpms with Lab B1 31's.
Ordered with no Gen, no refridge, and pump out head to save weight.

RT, let Ann take the wheel, I am sure she could find the missing 2 mph.

01 382 with boxes, bravo X, labbed 28p 4 blade usually 74 top speed saw 75 once...

With boxes I would think you would run faster than that. More like 77-78. 382's with 500's should run those speeds without boxes.

How long has it been since it had a tune up ?

I am not sure, bought the boat from pier 57 this year and they had no answer on that for me. Will tune up this spring and see.

I've seen these exact GPS numbers on an identical 382.
On glass smooth water I had a hard time breaking 68-69.