In Reply to: Y2K owners - is your speedometer accurate? posted by Tired of getting passed by Escorts! on January 15, 2000 at 16:50:51:
According to the literature I saw a speedo may be up to +10% PLUS 2.4mph (or 2.7 I can't recall) on the high side of accurate and be considered within tolerance for the speedo. It is NOT allowed to be below the correct speed.
The odometer is not effected by the speedos error.