As far as fe measurement goes, instrumentation is probably a good thing (I don't have any). But as far as P&G goes I don't think you need anything.
Back when I P&G'd I did it like Metro99- 5th gear only. So, I'd go up to 55 or 60 then glide down to as slow as the car would stand 5th gear operations- about 20 mph. More glide, less starting and stopping than, say, 40 to 55 P&Ging.
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