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Jayliu - SentraSE-R is right - your gauge (ScanGauge, UltraGauge?) may not be properly configured to show when your engine is in fuel-cut.
Alternatively, you could also try monitoring the Loop status (Open/Closed). You might see that change (from closed to open) when the engine is in fuel cut mode even if the fuel/hour may not.
And I bet if you went on an Accord forum, someone with the factory service manual would be able to detail the exact conditions under which fuel cut occurs. As was said, it's different for different vehicles, and depends on a number of variables.
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