I have a 260 and fairly empty, but always with a relatively full 75 gallon fuel tank and 15 gallon water tank I get 36 gps top end before the carb rebuild. Didn't test afterwards. RPM not sure the tach is testy at best I use my ears to listen for any over-rev issues.
What Carver do you have?
If you have a couple hours to kill some brain cells here is my thread in another forum: