Just wanted to follow up and modify this review quickly, since I have driven on these a bit more, and winter is coming.
On a 1200-mile road trip (round trip) with the CrossClimate+ plus Dekagrams, I got 290Wh/mi average, driving at 80mph most of the time.
I think they are very slightly more efficient than the PS4S, but unlike I said above, I think it is a very small difference at freeway speeds. However, it is hard to separate the aero differences between the Dekagrams and the 20" wheels - it is quite possible that the inferior aero of the Dekagrams (compared to 20" wheels) is hurting the overall performance. The reason I think this is because in my commute at lower speeds, I do seem to get about 20Wh/mi better than the PS4S. HOWEVER, at freeway speeds, the difference disappears, and in order for the Tesla range estimator to work correctly, I have to select the 20" wheel option. If I use the 19" or 18" options, the range predictor is excessively optimistic. So that suggests to me this wheel & tire combo is basically equivalent to the Tesla 20" wheels on the freeway, at least when traveling around 80mph.
Overall the noise is ok, but they are somewhat louder than the PS4S. It does not bother me.
Overall they seem like fine tires and I really have no complaints, but I just want to point out that unlike I said earlier the efficiency improvements (for this combination at least) are basically not there - if there is any improvement it is small. It's quite possible that if I were able to use aero wheels I'd see much better results on the freeway (with relatively little change to the slightly improved in-city efficiency).
Regarding ride and noise, I do feel like they probably are slightly less harsh, but there is a bit more noise from them overall. And as mentioned above, of course the grip is not as good.