Thanks. Yeah, I definitely don't understand fully.
While I see what you're saying in the EPA datafile, this does not mean that 5-cycle testing was actually used, AFAIK.
See this document - 2020 Model 3 P -> Clearly, unambiguously 2-cycle testing;
definitely, definitely not 5-cycle testing:
https://iaspub.epa.gov/otaqpub/display_file.jsp?docid=48712&flag=1
Looks like they might be using option "3" in the document linked below, hence the "5-cycle" calculation "Calc Approach Desc" in the EPA datafile. But it appears to clearly be incorrect to take this to mean a 5-cycle test was used. It does mean that they received EPA approval for the chosen scale factor (I think), but the factors taken into account when using this higher scaling factor are very unclear and a mystery to me.
https://www.fueleconomy.gov/feg/pdfs/EPA test procedure for EVs-PHEVs-11-14-2017.pdf
As far as I can tell, all this 2-cycle vs. 5-cycle column entry in the EPA datafile correlates well with is the presence of an (apparently) arbitrary scalar other than 0.7 when converting from 2-cycle results to the "expected" 5-cycle results. You can see here it correlates pretty well:
View attachment 509039
So far, it seems like the higher value just makes the results look better - and there is no indication of the rationale for the increased numbers. I'm not saying that a valid rationale does not exist. I just wish I knew what exactly the rationale was for coming up with a scalar that is 7% higher and increases all the label numbers by 7% relative to a factor 0.7. What is it, for example, about the 19" & 20" 2020 Model 3 P which warrants a more optimistic scaling of their much lower (due to tires) 2-cycle results to 5-cycle results, relative to the 18" 2020 Model 3 P? These should be extremely similar vehicles, and I don't know what would
not be captured in the coastdown measurements which would need to be factored into the conversion scaling.
Anyway, I track this scalar in my spreadsheet, even though I don't understand its source:
2020, 2019, 2018 Model 3 Battery Capacities & Charging Constants
Does anyone know why EVs are not
required to use the 5-cycle test? Seems like it would be a lot simpler, and would incentivize better cold weather results!