You were talking about 265Wh/mi for 70mph, right?
75 mph gives about 275Wh/mi.
That 75mph with 275Wh/mi is with my car from this weekend, trying to "hypermile" it at 75mph.
Well, that 150Wh/mi (aero component) (@70mph?) I believe is further from the
actual number than my original 85Wh/mi estimate.
The only way I can get a reasonable fit to what I observe (at sea level!!!) is to use something like 100Wh/mi @
70mph.
Using this and my 75mph 275Wh/mi datapoint (which, incidentally, had aero help since there was moderate traffic but not enough to slow me down), I get:
275Wh/mi-100Wh/mi( (75/70)^2-(65/70)^2 ) = 246Wh/mi => To me that is "close" to 250Wh/mi, especially considering the aero help from the traffic for the 275Wh/mi @ 75mph base number.
Aside: It may well be that the modest traffic I've dealt with on freeways is obfuscating my results and confusing me about the true aero impact of different speeds. I could see it making things confusing for me. Though generally it would be helping my results so it seems like it would make things even worse than I think.
I'm really starting to want to just do a measurement of this. Wouldn't be that hard on a flat quiet section of freeway when winds are calm! It seems like it would be easy to simply do a run (round trip desirable but not essential) at 80mph and another at 60mph.
(best guess right now IIRC is LR is nominal 75kWh, so you need about 242Wh/mi to hit 310 mi, assuming you don't go to the emergency reserve)
I used to think it worked this way. There are threads devoted to this topic, but if you actually measure it in your own car (compare trip meter kWh to the number of rated miles used), you'll come up with a different result than 242Wh/mi. The result I get is between 230Wh/rmi and 235Wh/rmi. I've measured this in my car for long (~100 mile) trips a couple times recently. It's kind of annoying to do, though, and there are many pitfalls which can skew the results, so you can just take my word for it.
I plan to measure it again at some point but long trips are kind of required to get the accuracy.
That is the topic of a different conversation, though it is relevant here since it does affect how you interpret the trip meter numbers and what they say about how far you can go without entering the emergency reserve. It does not mean the battery is not 75kWh; it could just mean the trip meter doesn't count everything - typically it seems to be about 3-4% "low". (If you look at the hypermiling record, it suggests this, actually - they had just 110Wh/mi for a 606mile trip - and 66kWh used - but this was a year ago so the meter may not indicate the same way with the current software - it may be scaled to get closer to 75kWh...or it may be that for low consumption the meter just is not as accurate (in fact today
@Zoomit posted some quotes from someone else about that - the higher the draw, the more accurate the metering, was the implication).)
Anyway, I believe that in the AWD you need to get indicated Wh/mi of better than about 232Wh/mi (splitting difference) to get 310 miles. Same for the performance. So a ~250Wh/mi result at 65mph results in about 290 miles.
