The '06 model HAH offers a few nice improvements (spare tire, sunroof, stability control). I've had my HAH for a couple months now, and have my own list of improvements I'd like to see:

1. More auto stop: Why must we come to a stop to power down the ICE!? there should be more generous criteria, like coasting at any speed for 3 seconds and tapping the brake. It could stay powered down until you press the gas pedal again. I think on the highway at 60 or so, this would make sense and not interfere with driving at all. Especially nice for coasting down long hills.

2. Bigger battery: I usually don't get over 5 bars, but recently drove up in the VT hills and got 6 bars when coasting down hill. Unfortunately, I reached 6 bars half way down - the rest of the hill was wasted as there was no more battery to charge.

3. Bigger electric motor/smaller ICE - how about a 4 cylinder Accord with a 30 HP electric. It would be nice to average 40mpg rather than 33. This would probably require the bigger battery.

What else would people like to have improved?