My car usually idles at ~750revs but often recently it's been idling at ~950revs. I've noticed this very occasionally when stopped at traffic lights before and put it down to a first stage regen, as it prevented the auto-stop/start kicking in and usually only lasted part of a journey - the next time I stopped at lights, it would be idling normally. Over the last week or two though - during this freezing weather - the car has been idling at ~950revs quite a lot. In case it's relevant, it's also been taking an awful long time for the engine to reach temperature. This morning, for instance, it was -3°C on my commute and it took about 25 minutes and 15-20 miles for the temperature gauge to reach 90°. I don't think this recent fast-idling is regen because I can still use auto start-stop (providing there's nothing else preventing it, like using the aircon or demister etc). My only theory is that perhaps the car is idling faster due to the cold? Has anyone else noticed their cars idling faster than usual in the recent cold weather? I have an Ecomotive 1.6CR (with DPF) by the way. It's booked in for its first service in a couple of weeks, so I'll mention it to the dealer when I drop it off but I'd still be interested in any theories.