Tesla Motors Club

Need explanation or enlightenment - My new 2020 X LR+ 350 "rated" mi MX gets 260 miles really. See the TeslaFi info below. I am getting over 350 "rated" miles, whatever that means. So what does one need to do to get "rated" miles? What I learned from this trip (which was an out and back, Mesa AZ to Eherenberg AZ Supercharger and back) is that highway trips in the 2020 MX take about 35% more clock time than the same trip in an ICE vehicle (2 road hours and 45 min SC time). This was somewhat of a disappointment. So like everyone else on the road, in AZ I drive 80 (in a 75). Not much ascent/descent.