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you are right, you could do it an run until the top speed of the car, or do it until a specific speed (like for example 80mph)
i was thinking of how long it takes to drop a set speed, the resolution of the graph is you choice bu i think 5km/h is good enought
when accelerating from 0 the obstacle to beat is vehicles mass, but that work in favor of you when your doing P&G so the higher speed, the higher mass, the longer the glide will be, and finding out the max speed you can accelerate without working the engine to hard to get to it would make the P&G more efficient
also i heard of a driving style that focuses on just maintaining a constant speed, well i saw a chart where a slower speed (40mp/h) meant more fuel economy than the next step up (60mp/h) and the increase speed means increased momentum, so you can just ease off the accelerator and keep it on a very light load, and when a incline comes, you'll have more than enough kinetic energy to go up the hill with minimum loss (meaning you'll gain it back on the downhill)
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