It is also educational and provides an opportunity to broaden our understanding and appreciation of our Mexican neighbors. Pemex is the only gasoline producer in Mexico and most stations are locally owned and operated. While prices are standard, there is much competition to provide the best service. The quality of Mexican gasoline is not a problem. Magna Sin is the equivalent to unleaded.
Some stations also sell diesel fuel.
It is wise to buy your gas at busy stations to assure frequent inventory turnover and fresh fuel. Under a joint agreement between the U.S. and Mexican governments, floating checkpoints manned by the Mexican Army have been established to control contraband movement. These guards are courteous and will explain why they are stopping you. Signage is also posted in English and Spanish. There is no need to be alarmed.