Bokazoit said:
Is it legal to claim such range if it is not posible at all?
I don't know where you live and where VW is claiming 190km range, but I'm going to say yes, it is legal.
Even VW's recent emissions cheating code was technically legal - the cars passed the tests in the way the tests were conducted. They may never have had similar results in real life, but the letter of the law is to pass the test prescribed by the law. Sure, they violated the spirit of the law but the problem is as much with the way the tests are structured than any individual company trying to game the test (and I'm sure more than VW do it).
It's the same with the electric range claims. There will be a test prescribed by the appropriate authority and the car will have been evaluated against that test. It doesn't mean you'll get that range everyday in normal usage, it's just a means to make nominally equivalent comparisons between manufacturers. Even that is of dubious utility though if what's really being tested is the manufacturer's software department's ability to adjust the car for the test.