Automatic.
In my Odyssey I can get 10-20% better highway mileage using P&G, where glide = neutral. If you're not willing to use neutral, just stick to steady speed. The engine braking from in-gear "gliding" will cost you dearly.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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