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I run my tanks the way the owners manual recommends. If you fill them all and refill to take care of any slant caused by unequal fuel weight you should have very close to 128 gallons. Run your mains for the first hour. Then switch to one aux and write down the time. 15 minutes later switch to you other aux. This is so you won't have both tanks running dry at the same time. At cruise you it will take approximately 49 minutes to exhaust your aux tanks. If you pay attention to your fuel flow you will see minor fluctuations before the tank runs dry. Switch then and you won't even notice the event. 15 minutes later you will need to switch your other tank. You will notice yours mains will almost be full again. That is all the fuel you have and you won't be dilly dallying around with "how much do i have in my aux tanks". Also switching from dry mains to aux's is a good way to kill your self. The aux's aren't connected to the aux fuel pumps.
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