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Any detriment to fuel mileage could only be as a result of the heater drawing heat from the engine before it reaches optimal operating temperature, and once you're rolling, no matter the ambient temperature, you'll be at operating temperature within minutes. My thinking is, the overall dent in fuel economy would be immeasurable. It's worse to turn the key and drive away when it's bitterly cold.
Now, if you leave the car idling in the driveway for thirty minutes to "warm-up," that would be a big waste of gas.
Set the climate control on AUTO or ECON; it knows what to do. Let the engine warm-up for a minute or three on cold mornings, and drive.
dcb
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