I log each tank. Don't have a scan gauge or equivalent to tell me the second to second mileage. I find the empirical data very interesting and necessary to design and test a system. Data logging is necessary. I can see the need to teach you how to drive. What really counts is the long term mileage like the tank or the week month or year.
Aero mods are clearly your best bang for the buck, but do you have engine mods on your truck too? Turbo diesel motors have many great mods available to reach their potential. My trucks now have some standard mods that many do, but the future will see some custom 1 of a kind mods to help with pumping losses and thermal losses. Best thing about the next round of mods is power, efficiency, smoke control and emissions all improve.
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