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You said motorway speeds, but then state you were on the Autobahn doing 100mph+. Most other jurisdictions/autoways this speed is illegal. I definitely see my
by r00fus 5y ago
You said motorway speeds, but then state you were on the Autobahn doing 100mph+. Most other jurisdictions/autoways this speed is illegal. I definitely see my battery going down massively at 80mph/130kph speeds+ on my non-Tesla EV.
In fact, going such speeds is probably massively inefficient for ICE cars as well, just that they're already incredibly inefficient already that you don't see much of a loss.
- maxwell86 5y agoIn Germany, the autobahn is the motorway. I typically drive at 180-190kph, that’s my “relaxed driving” speed. 160kph is “falling asleep” kind of speed unless you have a super loud car.
- jhoechtl 5y agoYou are aware that on the German Autobahn, outside designated speed limits, there is no speed limit? Believe it or not ... On Austrian highways its nominally 130km.
- withinboredom 5y agoI dated an vehicle design engineer once. She told me that cars create drag at a logarithmic rate at basically for every mph over 80, most people design them to use nearly double the fuel consumption to maintain. You can get some aerodynamic cars that are designed for 90mph, but it’s pretty rare in the consumer space. This was also nearly 10 years ago and I could be remembering it wrong.
- r00fus 5y agoDrag is the square of velocity, so not sure how your former date got logarithmic for that, sounds quadratic. Equation [1]: F(d) = 1/2v^2CdA Lowering the Cd (drag coefficient) and area can significantly reduce your drag. [1] https://en.wikipedia.org/wiki/Drag_(physics) https://en.wikipedia.org/wiki/Drag_(physics)
- withinboredom 5y agoI think she was talking about fuel consumption and drag, not just drag. But like I said, it was a really long time ago.