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Modern heater fans draw close to the same wattage whether they're set to their lowest or highest setting. All they do is bridge different resistors at their lower speeds. I'm thinking your AC is running when your heater is, to dehumidify the cabin air. It's not logical for just the heater and fan to draw 2 mpg.
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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