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Hi,
JoeQ, If you can get your local Caterpilar dealer ( I don't actually know if there is one near you or not) to do a Performance Analysis Report (PAR) on your engines this will answer a lot of questions for you in one go. It will tell you how much you burn at what revs with figures exactly as taken from your particular boat where you may have differences that others do or don't have.If you ask them to do a single engine comparison test as a part of it It will also enable you to determine when running on just one engine how much power you can apply before you are overloading the engine.
Failing being able to get a CAT guy to do it a set of good calibrated Flow Meters in the fuel lines will be half the battle and do your own trials.
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Cheers,
K1W1
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