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Range in app?

Glan gluaisne

Supporting Member
Sep 11, 2019
2,782
2,704
UK
The difference between 70 and 80 mph is quite surprising, something to do with the maths of air resistance increasing non-linearly with speed. In short, you will squeeze a lot more out at 70 than 80, even more at 60. I can only presume that this is why I often notice EVs on the inside lane being driven by owners sporting imaginary halos or the look of fear on their face as they dice with it to make it to their next charger.

Just done a rough and ready approximate plot of speed versus power needed to overcome aerodynamic drag for the Model 3. I used a projected frontal area of 2.22m² and a value for Cd of 0.23. The plot shows clearly how the power needed, and hence drain from the battery pack, rises with speed:

Model 3 drag.jpg
 

Jeeves

Member
Feb 12, 2020
506
285
UK
Indeed, but careful that halo doesn’t fall off and choke you.

It’s all very well and good knowing the theory, but I only truly accepted it when I did the experiment for myself looking at the energy graph for multiple 10 or 30 mile stretches on a trip at various constant speeds. Good to know if one is anxious about completing a journey across a supercharger desert in the freezing cold.

Thankfully, I rarely need to worry about it. Even though the car might be quite inefficient, there is usually enough to get me to the next pit stop at an interval that I would normally be stopping at in an ICE car anyway. The big exception for me is rural Wales (or anywhere west of Sarn) which sometimes requires quite a bit of ABRPage.
 
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Glan gluaisne

Supporting Member
Sep 11, 2019
2,782
2,704
UK
There will be a "sweet spot" speed for best range, as what matters is energy use per unit distance, rather than energy use per unit time. Not sure where that might be, but would guess that it's probably somewhere between about 30mph and 50mph. I know that the sweet spot for the Prius was around 50mph, any faster and energy use rose fairly sharply, any slower and there was a very gradual increase in fuel consumption per unit distance. In practice, slowing right down to about 30mph didn't have a massive impact, but driving faster than about 55mph definitely did.
 

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