inspection not ready (drive cycle) after driving more than 1000 miles, help?

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I bought this 2007 expedition limited 10 days ago through an auction. I went to get it inspected and the mechanic told me I need to drive it for at least 50 miles at 55mph cruise speed. I did that, I actually drove about 1800 miles from philadelphia to detroit and back. after I went back to the mechanic to complete the inspection the car still showed not ready! I'm afraid that the computer has been tampered with!