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I don’t think you can make a minor adjustment to the speedometer or the pickup, at least inexpensively. A few MPH over is standard for most cars.
I have Virgos with KUMHO KH16, P195 60 R15 in a 92 244. I thought I was running a little slow but according to a Garmin, the speedometer was right on at 35 and 65 MPH.
The variance you see may be in the actual diameter of the tire you have. If you notice in Tirerack, different makes, and tires types will vary in the outside dia for the same size tire.
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