Diesel Truck Forum - TheDieselGarage.com - View Single Post - a few questions on the 7.3
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post #9 of (permalink) Old 08-15-2007, 08:43 PM
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Once a chip is added the overhead mileage indicators get confused and are no longer accurate. The only accurate way is the fill the tank to the top of the filler neck (Carefully) and then fill back to the same spot and calculate by hand.
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