Originally Posted by powermax
Latelly mine are almost always 100% closed. Canadian winter + short route to work.
I've seen them stay closed over 10+ miles lately in winter, but during the summer I almost never saw them even slightly move, doesn't mean they hadn't run calibration tests or to have been partially closed while driving but opening again when the car gets warm on a warm day.
Of course on 40+F days I've seen the shutters close when it was 20-30ish in the morning and then open up on the way to grab lunch even after only 1.3 miles or so.