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why Wh/mi and not mi/Wh?

Teefal

Member
Aug 11, 2020
118
126
Bethlehem PA USA
Always wondered this ... isn't mi/Wh easier for people to understand (like mpg?)

is it just to avoid fractions? 0.033, etc. Could do 1000mi/Wh, I guess.

Anyway ... need to flip your thinking ... 300 is worse than 280.

Could be so the consumption graph looks like the mountains you're climbing ;)
 
Last edited:

kishkaru

Member
Feb 3, 2020
131
85
The Bay, CA
mi/kWh = efficiency. Higher = better.
kWh/mi (or Wh/mi) = consumption. Lower = better.

I think Tesla was one of the first companies that used consumption reporting over efficiecny reporting, and now several other automakers are switching to it too.

I personally like using mi/kWh. I call it MPK (similar to MPG). I can ask other EV drivers "hey, what kind of MPK are you getting in your car?"
3 mi/kWh (or 333 Wh/mi) is my baseline at highway speeds. I have SoC % rather than range, as it makes it easy to guesstimate range on a trip (since rated range is not equal to real range). The math is easy to do in your head while driving.

So say I have 50% battery remaining, this means that I can drive (75 kWh * 50%) * 3 = 112 mi more.
To do the same calculation using consumption, the math is more difficult: (75 kWh * 50%) / 0.333 = 112 mi.

> Could be so the consumption graph looks like the mountains you're climbing
That's the real secret reason Tesla picked it, haha.😄
 

Hexo09

Member
Mar 8, 2021
41
29
Bay Area, CA
That's a good question. I grew up in Europe (France) and the measure for ICE cars there is the number of liters consumed/100km. So it is closer to what Tesla uses, but it does force you to do some math gymnastics in your head to calculate your range. But I like numbers, so I don't mind.
 

frankvb

Supporting Member
Feb 29, 2020
793
491
San Diego, CA
That's a good question. I grew up in Europe (France) and the measure for ICE cars there is the number of liters consumed/100km. So it is closer to what Tesla uses, but it does force you to do some math gymnastics in your head to calculate your range. But I like numbers, so I don't mind.
But it used to be km/l quite a long time ago (at least in the Netherlands). Can't remember exactly when the switch happened, could actually have been over a long transition period.
 

dyau

Member
Feb 1, 2021
32
10
seattle
would you rather multiply by miles to easily get what the total kwh is for your trip?

or would you rather multiply by kwh to get the total miles for your trip?


i think the first is more useful..
 

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