Other manufacturers that have just started may be playing significant catch-up to Tesla's lead.
Lessened range may have more to do with the system spending energy to keep the battery at optimal temperature.
Contrary to what others are saying here, Tesla had no "head start" or lead. The Volt came out the same year as the Model S (2011/2012) and the battery pack in there (LGChem + GM) is extremely well engineered.
(In general GM is far more cautious about many aspects of battery life than others. One of the reasons the Bolt has weaker/slower fast charging. They also have tended to focus on a lower segment of the market than others, too. Comparing a luxury vehicle Tesla against a Chevy Bolt is not exactly apples to apples)
Another couple of red flag in the AXIOS article was: "AAA found the loss in driving range could be as high as 41% with the heater on full blast." Hmmm, even with the recent Siberean cold air mass blast here in Colorado, I don't need the heater on full in my ICE cars with outside temps of -5F. Also, the recurrent.com study show some of the vehicles ratings based on verified range versus estimated range - why? Perhaps it's accurate, but mixed methodologies in the same study.