Yesterday I had to drive into Los Angeles at the start of morning rush hour. I was averaging about 5-20 miles per hour on the freeway and the traction battery was showing fully charged. Yet the ICE never shut off for something like 45 minutes straight.

The FE gauge just kept bouncing within a range of 5-60 mpg, but it never went into the 'E' range at all. And this was with fairly constant throttle input at particular, very-low speed when typically I would be cruising EV for periods of time. Later in the day it went back to normal.

I've never seen this happen before. Could it be some kind of cyclic conditioning of the battery? Does anyone know?