What are the empty weight and maximum takeoff weight of the Moller Skycar?
First of all, Wikipedia does not regard itself as a reliable source, and nor should you. It is only as reliable as the last editor, and since it is the encyclopedia that &quot;anyone can edit&quot; (and frequently does, me included :-) ), that is not saying much. In fact the last editor to touch those stats has messed it up and the stats given do not match the sources cited.
An aircraft's gross weight is the weight of the plane and everything on board. Typically the maximum gross weight is also the maximum takeoff weight (MTOW), although a few planes can take on extra fuel when airborne so that their gross weight then exceeds the MTOW.
As stated in another answer, the M400 is just a recurrent daydream and all figures are estimates provided by the daydreamer. But, with that in mind, the daydreamer's own numbers are clearly the definitive daydream. In other words, go with the website.