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It would be best to use all of the aux fuel because you cannot use the fuel boost pumps with the aux tanks for landings or takeoffs, if needed. Should an engine driven pump crap out, you'll loose the engine if the electric pumps cannot push the gas thru.
I select one aux tank, wait about 10 minutes, and switch the other tank over to aux. After about 55 minutes later, wait for the first engine to surge like its running out of gas, and switch back to the mains on that one. About 10 minutes later, the same with the opposite engine. Running an aux tank dry is acceptable and the only way to know that all the useable gas is out of it.
Gas that is in an obtainable tank serves no purpose.
One of the major mishap causes on the 336/337 models is fuel mismanagement.
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