Formula 292 twin 6.2s cruise 4100 wot 5150.But the last 300 rpm only gets me 2 mph so my fast cruise is about 4500 rpm.

Donzi Classic 18, 3650 rpm's is the sweet spot on my set up, MX6.2 single engine boat 1.65 gears heavily labbed 28p 3 blade on a -2 shorty, 51-53 mph gps, WFO 5150 @ 73-74 gps. Steve

2000 Formula 382 with Innovation 540/600's: 3800 to 4000 @ 50 to 55 mph.

Cruise is between 4000 and 4500 which nets 75 to 85mph. More often somewhere around 5000 for extended periods ( fast cruise ) which nets 95 to 98mph.
25 Daytona with a single 900 sc/efi.

My throttle has often been compared to a toggle switch. Dock and drive

I spend 95% of my time at 3400 rpms. That's 50mph on the dot, and makes for a nice comfortable cruise.

I run a little slower cruising speed than some.
2500-2600 rpm at 35-40 mph
wot 6400 at 117.

1994 Cigarette TOP GUN
I spend most of my time at 3200rpm, somtimes 3500rpm.
I only run it at WOT (5500rpm) 2 or 3 times a year towards the end of the season, for 10 seconds. Can't afford to break them, it's not worth the risk in my opinion. I want my boat to operate trouble free all summer.

Thats your cruise speed Run it like you stole it !!! Funny thats the same speed and RPM I run at WOT.

Ya, that's pretty much my philosophy, too. I like to boat, not wrench.

1980 OLD school 20' FORMULA with 500 HP BBC custom built alpha drive 25p 4 blade
cruise speed 45 to 50 mph @ 3,000 to 3,500 rpm 75% of the time.
WOT 74mph GPS @ 5,500 rpm with raised X dimension