Exhibit 7.1

PETRÓLEOS MEXICANOS, SUBSIDIARY ENTITIES AND SUBSIDIARY COMPANIES

Computation of ratio of earnings to fixed charges

(In thousands of Mexican pesos)

	2017			2016			2015			2014			2013
IFRS
Fixed Charges:
Interest capitalized in fixed assets		3,060,963			3,667,752			5,258,854			3,997,121			2,943,597
Interest expense		140,350,860			132,681,656			99,271,197			73,657,618			54,067,022
Amortization premiums related to indebtedness		(2,109,778	)		(1,610,183	)		(2,229,657	)		312,296			(1,890,710	)
Estimate of the interest within rental expense		418,883			500,654			450,760			242,436			159,380
Total Fixed Charges		141,720,928			135,239,879			102,681,154			78,209,471			55,279,289
Net income (loss)		(280,850,619	)		(191,144,342	)		(712,567,398	)		(265,542,989	)		(170,058,427	)
Hydrocarbon Income Tax (IRP)		—			—			—			(18,735,301	)		3,787,543
Income Tax and Others		(5,064,168	)		(12,640,369	)		(45,587,267	)		3,773,966			3,672,466
Cumulative effect of adoption of new accounting standards		—			—			—			—			—
Profit sharing in subsidiaries and affiliates (income from equity investees)		(360,440	)		(2,135,845	)		(2,318,115	)		(34,368	)		(706,710	)
Pretax income from continuing operations before income from equity investees		(286,275,227	)		(205,920,556	)		(760,472,780	)		(280,538,692	)		(163,305,128	)
Fixed Charges:		141,720,928			135,239,879			102,681,154			78,209,471			55,279,289
Amortization of interest capitalized		122,439			146,710			210,354			159,885			117,744
Distributed income of investments shares		180,675			293,397			359,941			736,302			914,116
Interest capitalized in fixed assets		(3,060,963	)		(3,667,752	)		(5,258,854	)		(3,997,121	)		(2,943,597	)
Earnings		(147,312,148	)		(73,908,322	)		(662,480,185	)		(205,430,155	)		(109,937,576	)
Amount by which fixed charges exceed earnings		289,033,076			209,148,201			765,161,339			283,639,626			165,216,865
Ratio of earnings to fixed charges		—			—			—			—			—