Took my first trip down to Santa Cruz in the S today. I was hoping to see regen give me some miles back on 17. On the way down there the mileage just stayed the same so I was a little disappointed. However, on the way back I did get some miles back. The weird part was that it didn't just increase by one mile at a time, but rather it suddenly jumped up by 3 miles all at once. (I was watching pretty closely.) Just curious what explanations people might have for this sudden jump. What does it tell us about the firmware/battery?