If you give a little gas as you shift it back into D, you can match the little blip it automatically adds, but with out any added drag. Then ease off the gas as it drops into top gear lockup.
Being a Honda automatic, it probably has the usual "35 mph max" flat-towing specification. I don't EOC on the highway with my Odyssey, but in town I do. Consider that you're getting ~200 mpg at highway speed with the engine idling. That still does a lot to your average.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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