Ive never been there, is there a Pemex Station or at least people selling fuel out of drums?
I haven't gone much further south than cataviña, so is there a Pemex or gas station between Cataviña and Guerrero Negro? Or no gas for the 150 mile stretch and only gas sold on side of the road?There are plenty of Pemex's before you reach that point.
Catavina to Guerrero Negro is the only place that fuel is sold on the side of the road.
Filling up in Loreto or Consitution you have plenty to get to La Paz
From Catavina Jesus Maria is the next Pemex that has fuel before you get to Guerrero Negro.