Auto guides and the motoring press are not good sources for an encyclopedia article about "luxury vehicle". This is because automakers feed the press a lot of BS (Boastful Superlatives) who then work hard to write articles adding even more BS to describe their products. The press earns credits from the hands that feed them. Add to this the fact that potential and actual purchasers of luxury vehicles have an insatiable  appetite  for this type of BS. Classifying a particular vehicle as "luxury" is also designed to easily make it superior to other vehicles even if the differences are superficial. Using self-serving BS in marketing claims is a very, very old invention that helps sell products, as well as fuel the fan base with "bragging" rights to which vehicles are "luxury". On the other hand, it is more difficult for most marketers to be humble and genuine. That is why an encyclopedia article has to avoid falling into the trap of using traditional marketing superlatives and hyperbole. —