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We just drove our "new" '97 Boxster 3.4 from California to Michigan across I-80 and to while away the hours I timed mile markers when I wasn't driving. Anyhoo, we tuned the cruise to give 45 second miles (+/-0.2 s timing 10 mile sections at a shot; hey, it's a long drive!) with the speedo indicating 83 most of the time and flashed 84 occasionally. The odometer showed a similar error, reading about 4% high.
Eric
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