Well, no state has been stronger on this issue than California, who sets fuel efficiency goals that are the most stringent. The same cannot be said of Texas and Nevada; if anything the opposite is true. These are states where people take pride in driving big gas guzzling trucks and the government supports them in that.
Everyone loves to complain about how restrictive CA is, but what about when the substance lines up with what one supposedly believes? Why would Musk want Tesla to support Texas over CA? That seems backward unless his goal is the success of Tesla as a business, rather than progress against global warming.