The peak efficiency is at around 38mph

https://cdn.shopify.com/s/files/1/0196/5170/files/model_s100...

Presuming that the AC condensor gets airflow from the car moving through the air, it is going to be more efficient if the car is moving faster. However after a point, the air resistance will be hurting range more than anything.

My Aircon uses about 4kw (3 to 4 is typical) plus several 100s W for the fan. So ev usage time times that is the reduced power available and thus reduced range. It is just as noticeable on a petrol car especially on lower power compact versions, it won't have too much impact on gas guzzling engines since they are already inefficient and usually more powerful so it is less noticeable, though the added consumption will be more of course.

Kona EV has a page on power consumption, which at 30C ambient temperature and a long drive said I used about 4% on AC. Same amount goes to "electronics" which I find surprising.

didnt you read the scamvertis^^^article?

“There’s a huge opportunity in electric vehicles (EVs) and particularly electric buses because integration of our dehumidifiers in their air conditioning systems can extend their driving ranges by up to 75 percent,” said Matt Jore, CEO of Montana Technologies.

__extend their driving ranges by up to 75 percent__

I'd be interested in seeing data on that too.