I have a 1436 with a 8hp 2 stroke. With just me and a few gallons of gas, I can run about 21-23 mph. Add a battery and a couple anchors, 19-20mph, Add another person, ice chest, and fishing gear, 15-16 mph.
Of course, I've always wondered if the previous owner did something to the motor because is seems REAL powerful for an 8hp.