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*points at thermometer* My subaru runs intake temps about 20-25 degress above the external temps...at -16, I would venture to say the jeeps are no better (especially know their intake layout). He is probably operating at a 5-15 degree manifold temp. If it was zero outside for a few days he might see 1-2 mpg improvement.
My Subaru down the highway in the morning (beginning of commute) does upper 20's, on the way back (end of trip) i'm getting in the low thirties. Engine warmth is huge in winter. Hell at -16 it could be oil related. He probably has to drive 30 minutes just to get the engine up to 180!
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