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You're generally right about the heater. A couple exceptions:
- My car often doesn't reach full operating temperature before I arrive, so using the heater will keep it in gas-thirsty warmup mode longer. Once it's warm, the heater is nearly free.
- If the heater is also running AC for the dehumidifying effect. Many modern cars do this "automagically".
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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