3 ms·

> Seems like it’s common across all EVs for the range to be inflated by around 20%, at least for freeway driving. Most people speed on the freeway. Extra speed

> Seems like it’s common across all EVs for the range to be inflated by around 20%, at least for freeway driving. Most people speed on the freeway. Extra speed reduces range significantly.

Y_Y 3y ago
IMHO comments like this are much more valuable with some numbers. The linked figure[0] and associated paper report that efficiency peaks for EVs at around 20mph and then the cost per mile increases roughly linearly, by about 25 watt-hours when the speed increases by 10mph. Please excuse the archaic units. [0] https://www.researchgate.net/figure/ehicle-energy-economy-at-different-speeds_fig1_326822085 https://www.researchgate.net/figure/ehicle-energy-economy-at...
- vel0city 3y ago
  The Tesla Roadster is an absolutely ancient EV.
Y-bar 3y ago
This. And it is true of petrol cars as well. In my old clunker going from 110 km/h to 120km/h is a 9% speed increase but nets about 15% extra fuel consumption.
- JimtheCoder 3y ago
  Is this with the windows up or windows down...?
  - Y-bar 3y ago
    Yes.
pi-rat 3y ago
And much more than one would intuitively think. I just finished a long drive for summer vacation. Driving through Denmark (completely flat) at 130 km/h would absolutely wipe the battery, would be surprised if I managed even 350 km on a full charge. Driving over the mountains in Norway however, from 0m elevation to over 1000m and down again, at slower mountain roads (max 80 km/h), yielded almost 500 km on single charge. I did not expect flat+high speed vs hill-climbing+low speed would be that dramatically different.
- brookst 3y ago
  Air resistance is proportional to square of velocity. That goes up pretty quickly!
  - aaronblohowiak 3y ago
    And the power required to move against the air goes up by the cube of speed (as you multiply the resistance times your speed itself.)
- medvezhenok 3y ago
  I imagine that regenerative braking has a role here too. When you're going downhill the battery can recharge itself to some extent.
philwelch 3y ago
Yes, but Tesla goes out of their way to advertise how fast their cars are, so you think they'd expect and factor for this kind of driving behavior.
m463 3y ago
graphs: https://forum.abetterrouteplanner.com/blogs/entry/22-tesla-model-3-performance-vs-rwd-consumption-real-driving-data-from-233-cars/ https://forum.abetterrouteplanner.com/blogs/entry/22-tesla-m... https://forum.abetterrouteplanner.com/blogs/entry/9-tesla-model-s-consumption-vs-speed/ https://forum.abetterrouteplanner.com/blogs/entry/9-tesla-mo...

> Seems like it’s common across all EVs for the range to be inflated by around 20%, at least for freeway driving. Most people speed on the freeway. Extra speed reduces range significantly.

Y_Y 3y ago

IMHO comments like this are much more valuable with some numbers. The linked figure[0] and associated paper report that efficiency peaks for EVs at around 20mph and then the cost per mile increases roughly linearly, by about 25 watt-hours when the speed increases by 10mph. Please excuse the archaic units. [0] https://www.researchgate.net/figure/ehicle-energy-economy-at-different-speeds_fig1_326822085 https://www.researchgate.net/figure/ehicle-energy-economy-at...

vel0city 3y ago
The Tesla Roadster is an absolutely ancient EV.

Y-bar 3y ago

This. And it is true of petrol cars as well. In my old clunker going from 110 km/h to 120km/h is a 9% speed increase but nets about 15% extra fuel consumption.

JimtheCoder 3y ago
Is this with the windows up or windows down...?
- Y-bar 3y ago
  Yes.

pi-rat 3y ago

And much more than one would intuitively think. I just finished a long drive for summer vacation. Driving through Denmark (completely flat) at 130 km/h would absolutely wipe the battery, would be surprised if I managed even 350 km on a full charge. Driving over the mountains in Norway however, from 0m elevation to over 1000m and down again, at slower mountain roads (max 80 km/h), yielded almost 500 km on single charge. I did not expect flat+high speed vs hill-climbing+low speed would be that dramatically different.

brookst 3y ago
Air resistance is proportional to square of velocity. That goes up pretty quickly!
- aaronblohowiak 3y ago
  And the power required to move against the air goes up by the cube of speed (as you multiply the resistance times your speed itself.)
medvezhenok 3y ago
I imagine that regenerative braking has a role here too. When you're going downhill the battery can recharge itself to some extent.

philwelch 3y ago

Yes, but Tesla goes out of their way to advertise how fast their cars are, so you think they'd expect and factor for this kind of driving behavior.

m463 3y ago

graphs: https://forum.abetterrouteplanner.com/blogs/entry/22-tesla-model-3-performance-vs-rwd-consumption-real-driving-data-from-233-cars/ https://forum.abetterrouteplanner.com/blogs/entry/22-tesla-m... https://forum.abetterrouteplanner.com/blogs/entry/9-tesla-model-s-consumption-vs-speed/ https://forum.abetterrouteplanner.com/blogs/entry/9-tesla-mo...