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My car has a complex fuel economy display, and I know exactly what my fuel economy is at any given point. When I pull into the pump, I know what the tank is going to take within a tenth of a gallon, whether I fill it from 3/4 or empty. Fuel economy doesn't change a bit from tank level.
Something like a Scangauge or Ultragauge can give you average tank fuel economy, in addition to instant MPG. You can do that with Torque too, actually, but it requires that you are connected to the app 100% of the time you're driving.
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