@smashcz, I'm suffering the same issue. Purchased SR+ in March '19. After Elon announced option to downgrade, I reached out, and was finally downgraded on 8/31. Unfortunately, since the downgrade, my 100% charge range has shown as 203 miles, not the 220 I was promised. About 2 weeks prior to the downgrade I charged to 100% and was shown 239 miles, so I don't believe it is a matter of battery degradation. Tesla service center rep called me and told me that when I charged to 100% that I actually set it to 89%, which would result in 228 mi of range, which is better than promised, so I should be happy. He didn't want to listen when I told him that it was definitely not set to 89%, and that at any point you can look at battery % and range and calculate the 100% range and it results in about 203 mi. Not sure how to go about resolving this issue - Tesla seems unwilling to help.