Here is the long version, which will cover all of that, including the expected BS factors.
I can tell you from experience that it is not possible to be accurate, but it works in both directions.
I don't waste my time looking at EV range specs. Same with charge times.
For the average EV car, I expect 3.5 miles per KWH of the battery capacity on the freeway, more if off the freeway. IOW, expect a 100 KWH battery to normally get you 350 miles and that will be realistic in most reasonable cases. Range will be better 50% and worse 50% of the time.
For charge times, I only want to know the charging rates in KW as well as battery KWH capacity. Because of this, it makes more sense to look at charge times as miles added per KWH of charge.
On an electric motorcycle, I expect 7 miles per KWH and for the range to about double every time going half the speed. Or half the range every time the speed is doubled. Cars are more aerodynamic than are motorcycles, so with cars it isn't as extreme.
-Don- Reno, NV