Zero idling for warmup here. I give my car a push until it engages the downhill slope of my driveway from the flat of the garage, then back it into the street, put it in 1st, start the car and immediately drive away ... gently. Takes about 7 miles of level driving to get it to operating temp (winter or summer, there's not a whole lot of difference here in the SF Bay Area).
My Subaru has a blue dash light that remains lit until the water temp gets to 120, at that point you're supposed to be able to drive 'normally'. My Tstat opens at 190 and my fans kick on at 212 (all of this data comes from my UG).
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