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I agree with Mitch. Running the Skymaster on one engine will require a lot of power to maintain altitude, and I would worry about what you would be doing to the engine.
Also, on that year aircraft, you cannot burn from the aux for climb. You have to burn from the main for an hour before using the aux. If you don't, you will vent the return flow from the engine (something like 5 gph I think, but I am not sure) overboard.
Run 'em both at 55% power or so. You will get much better efficiency, much easier on the engines. And please look into the fuel system carefully.
Kevin
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