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Lots of times & places where speed makes no difference to fuel economy, or even increases it. Take for instance yesterday, me coming down from Carson Pass (8500 ft) to the valley at about 5000 ft. Seems pretty obvious that I use the same amount of fuel - approximately zero - on that stretch. In fact, if I go somewhat (ok, quite a bit :-)) faster than 55, I can coast over some of the small rises, and further along the level at the bottom.
Likewise, if I'm headed into town (small ups & downs, with a couple hundred feet total change), I get the same or better FE by keeping speed high on the downgrades, so as to coast more on the flats and upgrades - yet I see a lot of brake lights on the downhill, as people waste fuel to stay within the posted limit.
And to the previous poster who thinks 55 is "old people" thinking, I suggest you take your ageism and use it as a suppository.
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