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Old 03-30-2010, 09:33 PM   #3 (permalink)
Lazarus
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Join Date: Nov 2007
Location: Central Texas
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Iron Horse (retired) - '97 Iron horse Intrepid

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Unless you reset the tank average it will show what the cumulative average is. So it will be off if you tansfer from one to the other without doing anything.

As Old Tele man stated if you did not set the engine perameters for your dads truck the reading won't be right. Also if you remove power from the device, as in unplugging it, sometimes it will reset to default vaules. Double check that the setup is correct or your numbers will be off.
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