Petró-Chico was a branch of Poseidon Oil operating in the barren Mexican oil fields following the American take-over in the early 2050s. Based in the states of Veracruz, Puebla, and Hidalgo, Petró-Chico oil flowed across the Rio Grande into the southern US, as far as Las Vegas, Nevada. Bearing the ominous label of "un amigo de Poseidon Energy", it is meant to showcase Poseidon's far-reaching and international hold over the world's economy.