I just got back from pre-running the whole B1k course in a RZR and chasing with my ED. We bought a lot of diesel fuel down there including Baja Sur and had no issues. We averaged 15mpg on the trip but that is another story. I was on the lookout for LSD or ULSD signs at the gas stations but never saw one. The only thing to note is I have a GDE tune in my truck, not sure if it helped. Enjoy your trip and watch out for the big trucks.