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My gas gauge reading is wrong. . my fuel mileage reading is off.

(2005 GMC Sierra 1500)
in Yuma, AZ on May 23, 2013
when i put gas in the feature that tells me how many more miles i can travel is always wrong. It will read 120 miles left, and I travel 10 miles and am out of gas.
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Popular Answer
of Greg's Orange Auto on May 23, 2013
poss fuel tank sending unit but have gauge sweep test perform 1st as to test gauge
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