My driving for that tank was mostly in town just running errands around town and a little bit of highway. I may have driven when it was congested maybe twice for little less than 20 minutes. In town speed is generally 60km/h or 37mph and highways are 100km/h or 60mph maybe a little more or less depending on the time of day but generally around that. Always waited for the engine to warm up before driving and I never accelerated too quickly from a light.
Ding! Ding!
I think we found the answer - you shouldn't let a modern engine warm up by idling - it will warm up faster if you drive it as soon as you start it (and you will burn a heck of a lot less gas if most of your trips are really short). The only exception to this rule would be if you were in an arctic blast, colder than -15 or -20 C (that's colder than 5 F to -4 F for the Fahrenheit people). Even in extreme cold I would only let it idle 2-4 minutes at most (just enough time to clear your windows of ice).