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I nearly always choose the longer, but non-stop, routing.
Whether in my pickup or at work in the Peterbilt. FE is really just a way of showing lower fuel burn for the same work accomplished. In this instance -- routing -- the stop'n'go is detrimental to the rest of the vehicle (non-steady fluid temps, tire temps, etc) and requires more inputs from the driver.
Thus, while I travel a bit farther (there is a trade-off of miles versus savings at some point) I feel assured that the fewer stops/accelerations is the best course to take for longest vehicle life. And for the driver to retain as much energy as possible (this is not discussed, but vital to more than FE, it is central to safety).
That is the larger metric over FE -- vehicle longevity -- and the one that really counts. Once the vehicle is broken-in, we do not want any degradation from that point onwards. Longest life in tires, brakes, etc, is directly to that end as well.
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