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Under no contition, would I ever purposely run one tank dry.
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As long as you are in "both", it wouldn't matter if you ran a tank dry.
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If you were in "both" you probably wouldn't know if you did run one tank empty.
Running a fuel tank completely dry is completly harmless if it is done at altitude. Once the engine starts to sputter, you switch tanks, and about 15 seconds later it will smooth right up.
All the myths you have heard about contamination, and fuel pumps lubed by the fuel are false.