Calculating Fuel Needs and fueling at a Petro TA. How much diesel do I need?

How to fuel a semi tractor trailer at a TA or Petro without the app. Also how to do the mileage calculations to see how much fuel you need.
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Видео Calculating Fuel Needs and fueling at a Petro TA. How much diesel do I need? канала JJ the Trucker