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> when I've been sitting at a stop -- the Energy display shows everything off

Nothing is shown when you are stopped. So there really isn't a built-in way to tell by sight (unless the battery-pack is being charge).

> Is there a foolproof way to tell if the ICE is really running?

Just buy an aftermarket indicator-light from

> I get the characteristic slight shudder.

The ICE might be off already and you're actually be feeling the cooling-pump shut off instead.
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