Driving my Brava yesterday (yes, bring it on, it's Italian blah, blah, blah) I joined the motorway and gave it a boot through the gears up the slip road. Once I joined the motorway there was a stink of petrol. This eventually subsided, I can't be sure it was my car or another one and may be purely coincidental.
As I drove along the motorway I saw the temp gauge start to fall very slowly. It continued to do this until it stopped at around the quarter mark. It's never sat completely steady but usually bobs around either side of the half way mark. I did about twelve to fourteen miles on the motorway and the gauge would rise a little and fall to a quarter just like it does when sitting at half way.
When I reached my road home - four miles of country road - It rose to nearly half way and carried on as normal. So, should I be concerned? The only reason I can think for this to happen would be a thermostat sticking open. Anything else?