When I woke this morning, the outside temperature was 7F. I believe it was around 0F overnight. I averaged 46.5mpg on my 13 mile commute to work, and 45.5mpg on my way home, both cold starts.
On the way in, I held off running the heater until the coolant temperature hit 155F. It didn't reach 160F before I arrived. The grille is 100% blocked.
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