Petró-Chico

 is a pre-War company (part of the Poseidon Energy cartel) that distributed gas in Mexico. A billboard can be seen at the eyebot part of the E3 trailer of FNV, at the part where the camera goes at the eyebot's face.

There is a jumpsuit in New Vegas that has a patch with the company's name and logo on the chest.

Behind the scenes
Petró-Chico is most likely related to the Chico Petroleum gas station in California.

Appearances
Petró-Chico only appears in Fallout: New Vegas.