0F DEGREES
At 0F, the engine will run to warm up cabin and battery, so it starts at moderate load and runs rich to warm up the exhaust that has a heat exchanger on it for the heater core and battery cooling/warming, that may be burning lots of fuel.
On my C-Max PHEV, if I look at instant MPG, at 55MPH and when engine is charging battery it will show 20MPG, so you might be fighting that.
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Staying Focus'd on MPG
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