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Well with a manual, one test I heard about it is getting up to like 20 mph and taking your foot off the gas. Note how the car starts to slow down. Now "shut down" the engine with your key (still in gear, still moving). If you keep slowing down at a similar rate, you have DFCO. If it suddenly starts jerking to a stop...you don't. Be safe trying this if you do.
If I am engine breaking from a decent distance (but not far enough to simply coast in) I usually downshift at about 1500RPM because I believe at 1400RPM my engine starts getting fuel again.
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