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I like to use my aux tanks as soon as possible on long trips because you can't use the aux for landing. I wait the 60 minutes on the mains and then switch to the aux's and finish them early into the trip. I let the aux's run for 60 minutes and then switch the front back to the main while the rear runs out on the aux then once the main is back in place on the rear I switch the front back to the aux and run it out. Typically about 75 - 80 minutes per aux at normal cruise.
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
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