Well, it's not immune. My 2006 HCH did a recalibration in every sense of the classic Insight recalibration. It was a balmy 112 degrees out and probably significantly hotter inside the car. Auto stop will not even function at these temps. I was sitting at a light with the air running full bore to cool the car down, battery gauge showed 3 of 8 bars. I happened to look down right as the engine rpm's went up from ~800 rpm to ~1200 rpm and started showing 4 bars of charge. A few moments later the battery gauge started dropping away. It took several miles for the charge gauge to come back up, but it deffinitely wasn't an extreme thermal recalibration like the Insight did where it would need to sit overnight for the pack to cool down enough to accept a charge.
Now the good news. To someone who wasn't paying attention they'd have never noticed it. The by wire throttle system kind of works on a X position calls for X power output and adjusts transmission ratio to raise engine rpm's so it's pretty transparent. Some assist was still available with 0 bars on the battery gauge. It did not do an upward recalibration either like the Insight usually did after a few minutes so it was indeed needing to recalibrate the reading. This is the first time I've seen this on this car, it has about 7,400 miles on it.
Now the good news. To someone who wasn't paying attention they'd have never noticed it. The by wire throttle system kind of works on a X position calls for X power output and adjusts transmission ratio to raise engine rpm's so it's pretty transparent. Some assist was still available with 0 bars on the battery gauge. It did not do an upward recalibration either like the Insight usually did after a few minutes so it was indeed needing to recalibrate the reading. This is the first time I've seen this on this car, it has about 7,400 miles on it.