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I do see a change in my Odyssey between D and N. However, as you observed, having the AC on dwarfs that change. Try running the air on Auto-AC Off for a bit next time. Also, the Auto ac system is smart and cycles the compressor on and off only as needed - if it's cycling you'll see jumps in fuel consumption to match.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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