I'm fine tuning top speed BECAUSE it's also related to total efficiency.
Nearly all of my boating is cruising 3,000 - 4,000 rpm range, besides trolling.
To me, setting it up to run close to maximum possible speed is also RELATED to efficiency - to a degree, it means it's dragging the least amount - therefore long term easiest on the motor.
Viper prop - my understanding is the Viper runs better with the DFI motor, but the etec better with the Rebel. Reason - the etec produces more torque, and the Rebel is a bigger cupped prop.
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