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4-mpg
A 3-mpg drop for a full-size passenger car would not be uncommon during winter.
You get an extra whammy from the transfer case and front differential gears wetted with temp-induced higher viscosity lube do to the cold.
I'd like to say that a switch to synthetic gear oil would help,but my own experiences with Red Line full syn and Mobil-1 forbid me to.
There might be a little comfort in knowing that everyone else with a vehicle like your's is in the same boat.
I'm down a half mpg in the T-100 so far.I'll lose another 1.5 mpg before winter's over.
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