I drove about 200 miles home last night in the Prius. The trip started at 0F, and by the time we were home it was -9F. The Prius fared well, but it sure took a hit in the MPG department. I filled up before we left and managed a record low of 37.x mpg on the way home. About 1/4 of the trip is at 55 mph, and the rest at 70 mph. I didn't even get fully up to temperature until hitting the 70 mph zone as the heater use kept the engine at about 175F.
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