I would never run any engine wide open for an extended amount of time, diesel or gas. Like said above flo scan is great. If I'm driving a boat stay around 2/3 to 3/4max throttle. that also depends on the sea state, but for the most I get it up on a plane then give it a little more. The difference in fuel economy is huge with just a few RPMs over cruising speed, relatively speaking.
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