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The OEM temperature gauge won't tell you anything useful. Mine jumps to 5-6 bars when the coolant temp gets to 140 (per Scangauge), and stays there when the SG says ~220 climbing mountains in the heat.
It does take a while to warm up, even with a working thermostat - maybe 5-10 miles on level road, depending on outside temp.
You should see regen when decelerating (or with very light brake application) no matter what the temperature, as long as the computer doesn't think the battery's at full SOC. Autostop depends on outside temp: if it's warm, it will come on without the engine being fully warmed. There's some logic in there, so the colder it is outside, the warmer the engine has to be. Also, the climate control has to be off.
The one bar of charge showing makes me think that maybe you need to force a recal. To do this, pull a fuse (I think #18) from the box by the driver's left leg and wait 10 seconds.
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