The Magna comment comes from the news paper article, in any case whether one uses Magna or Premium or the Diesel and your vehicle runs OK that is all that matters going from point A to point B and beyond.
The interesting fact is that the few PEMEX gas stations in Texas sell fuel at much lower prices than Mexico, reason all the taxes that go with the fuel that in reality do not benefit the public in Mexico, all that money goes to some poiliticos pocket and the Sindicato de Travajadores Petroleros (union) a lot of persons that do not work but receive a "salary" but that is beginning to go away, an Australian petrol company won the bid to drill in one of the offshore plots last week or the week before, there is hope that maybe prices stay the same or will be lowered, although I doubt it, prices in Mexico are never lowered.
Que pasen un buen dia senores
navegator