this post was submitted on 25 Apr 2025
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As I understand it, the aerodynamics can be no joke on EVs. The acceleration is very efficient, there's very efficient regenerative braking, and an object in motion just continues in motion until there's a force. That means drag is pretty much where your whole battery charge goes. (I'm not sure how much tire flexing accounts for exactly)
For an example off the top of my head, the Arrow concept car manages 500km by not having side mirrors. Compare that to an ICE engine which wastes most of the fuel energy as heat, but to a widely varying degree depending on design and implemented energy recovery features.
This is generally in line with ice, the drivetrain efficiencies anymore are in the high 90%s (applies to ev too), so from engine out you are losing basically everything to drag.
On ICE vehicles you lose a lot more to braking
depends entirely on the kind of drive.
Yeah, friction losses scale with angular velocity and not torque, and moving a ton of metal takes torque. Don't forget the braking losses, though, unless it's a hybrid of some kind. There's no turning movement back into fuel the way you can turn it back into electricity.
The point is if you're looking good range, there's several dials that can be adjusted on an ICE car, related to the prime mover. On an EV, drag is the start and finish of the considerations (unless you're going to move it onto rails, maybe). And of course range is a huge deal, because a liter of secondary cell can't come close to the energy density of a liter of petrol and 38 liters of ambient air.
This is one thing I don't get for the complaints about EV's: Drag and towing. You have the same losses in ICE, just that the ICE powerplant is so much worse 'before' the drive