I'm not sure that there's an "optimal" average speed for best FE
DD, it's the per-tank average mph of which I was speaking. From 26-27 mph on up is a sign that idle time is low.
The relation of average mpg and average mph is, IMO, worth correlating for most drivers (as we most of us 90% of the time go to 90% of the same places) in, first, reducing overall fuel burn (no singleton trips), and then making the most of the [reduced] miles travelled. Average mph shows ups or downs quite easily (that may be masked by weather changes, etc, otherwise, in average mpg).
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