My son was just over with his Tesla M3, and I asked him what PSI he runs. His door says 42 PSI, but he runs his at 48, again to get better range. I just changed mine from 36 to 40, but have not driven enough to notice a difference.
i just did a 35 mile, mostly 65 to 70 mph trip..
Averaged 5.1mi/kwh. 33 mins for 35 miles average..Still 44 psi on all 4.. Maybe I had a little tail wind.. Lots of cars on the road, so that usually helps as I was tailgating other cara and trucks..