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LeanBurninating -
Welcome to EM! Another reason pulse-and-glide may not be optimum for the HX is that you need to be in a steady-state condition to trigger lean-burn. The ECU/PCM wants you to be in a sweet-spot range of different engine parameters. I think it's a combo of MPH+RPM+LOD that is weighted towards top gear freeway speeds.
At least, this is my understanding of what the VX does (the ancestor of the HX).
CarloSW2
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