About Pulse and Glide deltas

[Piotrsko]

freebeard is correct,

However, noise needs some sort of filter, no matter the definition of that noise, or its measurement, otherwise it simply degrades overall average of measurement. If you want to work with much smaller less accurate increments, then you don't have to remove the noise in your data, unless the result is so far off you need to change your original definition.

[Appletank]

Originally Posted by Piotrsko

freebeard is correct,

However, noise needs some sort of filter, no matter the definition of that noise, or its measurement, otherwise it simply degrades overall average of measurement. If you want to work with much smaller less accurate increments, then you don't have to remove the noise in your data, unless the result is so far off you need to change your original definition.

As mentioned earlier, my question is not about data collection, but about wanting to know why longer PnG cycles are recommended to maximize fuel economy. If they're the exact same but the car's readouts are inaccurate, that's another thing, but would also imply conventional wisdom wrong.

[freebeard]

I see a lot of advice... I'm a bit confused...

Assuming the same average speed and roughly similar pulse mpg, shouldn't a 35 mph average 37-32 range produce similar results to 40-30?

As I said, perhaps it does. You cite sources without providing them so we can evaluate (for instance) context, etc.

But keep asking until you get the answer you want.

[redpoint5]

Shorter but more frequent pulse and glide durations would tend to be more efficient since a more consistent speed is maintained, but then it puts more wear on the transmission components.

This is why automatic transmissions with many gears and CVTs have become so popular, to keep the engine at a higher BSFC for any given speed and power demand.

It's also part of the reason a hybrid is more efficient; a smaller engine is under higher load for any given cruise speed.