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Yes, if the miles driven and gas consumed for three tanks prior to tab installation is all you have, that'll help--but we might not be able to get a good confidence level in the results. The more post-tab data, the better; as that will help to narrow that part down.
Y'know, I really should be recording all my fill-ups, since I'll probably try aero mods sooner or later and the TDI doesn't need refills very often.
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