Yeah! They're better than not having them. But I am not convinced that either the average mpg or instantaneous
mph are all that accurate. Reasonable approximations, yes, but not completely reliable.
The indicator on my FEH message center for instantaneous economy, for example, does not specify a base for comparison. When the bar is full, it looks like good economy. But then I ask myself, compared to what?
With this understanding, I do think they are an excellent aid to learning and to keeping good driving habits.
Also, how about an emissions readout? Some of us are more concerned with that than of mileage - although they should be intimately related.
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06 FEH 2WD "Sainte Marie"