Bjørn Nyland recenty tested energy consumption in low and normal suspension settings to learn how much energy you can save in a Tesla Model S.
As it turns out, not so much at speeds of 100 km/h (62 mph). The difference in energy use is just 0.5%.
Increasing speed always makes energy consumption higher. At 130 km/h (81 mph) usage went from 195 Wh/km to 248 Wh/km, which is 27% more.
However, the difference between low and normal suspension setting stayed at a low level of just 1.6%. So, it seems speeds greatly impact energy consumption, suspension height not so much.
The next step will be tests at even higher speeds up to 200 km/h.
"This test shows how much energy you save by using low suspension at different speeds. Because this is a real life test, there are variables that could have affected the results."