Volks,
For any of you planning to venture into Mexico--
I've found that, despite what it says at the Pemex
pump, my van will *not run well at all on Pemex regular.
So when in the higher altitudes I always use premium;
on the coast, away from grades, I can get away with
regular--but even then I often have to mix it 50/50.

So consider yourselves warned...
Phaedra