Today's Price of Gasoline MAGNA

I often fuel up at a Pemex where the cabbies and the airport vehicles buy their fuel. This is also one of the stations that can test the fuel with a beaker. I am waiting for Arco to build more stations. My Silverado and my Wife's Rav 4 do not like Magna. The Rav gets a check engine light. The Silverado seems to run rough. Weird. NOB I burn regular. Some Japanese vehicles get plugged Catalytic convertors from Magna. But at least it is not like 25 years ago when your vehicle would ping or smoke from bad fuel!!

Moisheh