Exhibit 12.2

PETROLEOS MEXICANOS SUBSIDIARY ENTITIES AND SUBSIDIARY COMPANIES

Computation of ratio of earnings to fixed charges

(In Thousands of Mexican pesos)

	March 2013			March 2012
IFRS
Fixed Charges (1):
Interest capitalized in fixed assets		570,814			519,600
Interest expense		17,387,497			14,329,387
Total interest cost		17,958,311			14,848,987
Total Fixed Charges		17,958,311			14,848,987
Net income		(4,388,111	)		40,396,805
Hydrocarbon Income Tax (IRP)		1,323,364			1,214,515
Income Tax and Others		872,114			854,512
Cumulative effect of adoption of new accounting standards		0			0
Profit sharing in subsidiaries and affiliates (income from equity investees)		(238,064	)		163,815
Pretax income from continuing operations before income from equity investees		(2,430,697	)		42,629,648
Fixed Charges (1):		17,958,311			14,848,987
Amortization of interest capitalized		22,833			20,784
Distributed income of investments shares		—			—
Interest capitalized in fixed assets		570,814			519,600
Earnings		16,121,261			58,019,018
Amount by which fixed charges exceed earnings		1,837,050			—
Ratio of earnings to fixed charges		0.90			3.91

(1) These figures do not include rental expense