Another comment.
One thing that pops into my head is the sort of narrow idea of FE presented here. I actually use a three cylinder Metro with a scraper to pick up engine blocks, tow trailers and pick up sheet steel. I use the engine through the full range of rpms that it was designed for. I keep up with traffic on the expressway too.
In the past, I owned (amongst numerous other vehicles) a slant six equipped Valiant that I used to tow fully laden trailers over the Sierras -- so, doing a steady 4000 rpm for hundreds of miles uphill and downhill. Currently, I drive the Metro and the diesel Mercedes.
I think that I am hypermiling when I use the Metro in lieu of the 10mpg Grand Wagoneer that sits in my driveway as well -- getting roughly a 400% increase in mileage.
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