100,000 miles on the family Odyssey ('04) and whenever I drive it (~1/3 of the miles?) I'm constantly in and out of N. I mean multiple times per mile. That's how I can get the 23 mph highway van to return 30 mpg for our recent 3,000 mile summer vacation trip. Without the constant N coasting, it might do 26 or so.
As per the manual's towing instructions, I don't engine-off coast above 35 mph. Below that I do unless there's a good reason not to. (Kid's DVD playing, family requires AC, etc)
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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