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On my 1996, it has to be in gear, foot off the pedal, and above 1200 rpm. If you try a few coast-downs, you can feel a "surge" when the fuel flow comes back on. Our cars are different generations, sort of, but both have D-series engines.
With a DX, I'm assuming you also, like me, have no tachometer. Note the speed and which gear you're in for the coast-down, and you can calculate the rpm. Example: Max speed in 2nd gear is 62 mph. DFCO shuts down (surges) at 11 mph. Max rpm is 6900. 6900*(11/62) = 1224 rpm.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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