Remember Mexican pharmaceuticals? Mexican water? Building Codes? Air Pollution? Waterways Pollution? Need I go on?
I think that Mexican autos pretty much run like our, so if they don’t have problems with their fuel, I doubt an American would.
If you don’t care about your fuel injection or having a good running car buy Mexican. It’s not good gas. May as well pick up some tomatoes too.
I usually buy Chevron for my newer vehicles. It costs a few cents more, but really is the best.