Common issue, not much to be done about it other than keep it in mind, or check your speed via a GPS if you're using one, as that's a lot more likely to be dead on, at least by comparison.
Look at it this way: if you're 5mph (indicated) over the posted speed limit, you're virtually never speeding.
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-O/D
1997 Arctic Silver Boxster, 5-spd
IMSR + RMS
Robbins glass window top
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