New owner, first question, legitimate question, people can't even get their name or sex correct and two hours later people are calling them a troll because they have not followed up their question. No wonder they have not yet returned.
Wouldn't it have been better to answer the question, or keep your mouth shut if you didn't have an answer rather than just calling the o/p a troll. People have been locked up for less paranoia than this.
To the O/P. There are reasons why EV's may not give the range you are expecting. Some reasons are just like petrol or diesel engine cars not giving the MPG the manufacturers give. With an EV though, the consequences of getting it wrong are worse, so people get a bit more concerned. With an ICE, you just fill up a bit more often and don't notice it. There may also a brief conditioning period where new batteries reach optimal performance - I have heard things sort themselves out over the first 1000 miles or so.
Its great that you want to know why and analyze the problem. As a previous helpful post mentioned, there is an energy graph available on the screen that can track your current, average and projected usage whilst you drive. It should look similar to the below youtube screenshot.