Exactly one week later, and on the exact same stretch of road, the speedometer on the MINI started giving me erroneous readings again. A couple of restarts and it did not fix itself like it did last time. However, at some point it just picked up as I noticed it was (probably) reading correctly.
Unlike last time, the rev counter did not under-report.
Bermuda triangle-like area of San Diego ??
BERMUNDA SHORTS… 😉