Exhibit 7.1

PETRÓLEOS MEXICANOS, SUBSIDIARY ENTITIES AND SUBSIDIARY COMPANIES

Computation of ratio of earnings to fixed charges

(In thousands of Mexican pesos)



|                                                                             |  |      |              |   |      |  |              |      |  |  |              |   |  |      |            |   |  |  |              |  
|---------------------------------------------------------------------------- |  | ---- | ------------ | - | ---- |  | ------------ | ---- |  |  | ------------ | - |  | ---- | ---------- | - |  |  | ------------ | -
|                                                                             |  | 2015 |              |   | 2014 |  |              | 2013 |  |  | 2012         |   |  | 2011 |           
|IFRS                                                                         |  |      |              |   |      |  |              |      |  |  |              |   |  |      |            |   |  |  |              |  
|Fixed Charges:                                                               |  |      |              |   |      |  |              |      |  |  |              |   |  |      |            |   |  |  |              |  
|Interest capitalized in fixed assets                                         |  |      | 5,258,854    |   |      |  | 3,997,121    |      |  |  | 2,943,597    |   |  |      | 2,110,075  |   |  |  | 4,292,351    |  
|Interest expense                                                             |  |      | 99,271,197   |   |      |  | 73,657,618   |      |  |  | 54,067,022   |   |  |      | 72,951,202 |   |  |  | 63,003,854   |  
|Amortization premiums related to indebtedness                                |  |      | (2,229,657   | ) |      |  | 312,296      |      |  |  | (1,890,710   | ) |  |      | 1,560,478  |   |  |  | 762,387      |  
|Estimate of the interest within rental expense                               |  |      | 450,760      |   |      |  | 242,436      |      |  |  | 159,380      |   |  |      | 214,041    |   |  |  | 212,497      |  
|                                                                             |  |      |              |   |      |  |              |      |  |  |              |   |  |      |            |   |  |  |              |  
|Total Fixed Charges                                                          |  |      | 102,681,154  |   |      |  | 78,209,471   |      |  |  | 55,279,289   |   |  |      | 76,835,796 |   |  |  | 68,271,089   |  
|                                                                             |  |      |              |   |      |  |              |      |  |  |              |   |  |      |            |   |  |  |              |  
|Net income (loss)                                                            |  |      | (712,567,398 | ) |      |  | (265,542,989 | )    |  |  | (170,058,427 | ) |  |      | 2,600,478  |   |  |  | (106,942,256 | )
|Hydrocarbon Income Tax (IRP)                                                 |  |      |             |   |      |  | (18,735,301  | )    |  |  | 3,787,543    |   |  |      | 2,392,919  |   |  |  | (677,392     | )
|Income Tax and Others                                                        |  |      | (45,587,267  | ) |      |  | 3,773,966    |      |  |  | 3,672,466    |   |  |      | 2,138,856  |   |  |  | 3,853,408    |  
|Cumulative effect of adoption of new accounting standards                    |  |      |             |   |      |  |             |      |  |  |             |   |  |      |           |   |  |  |             |  
|Profit sharing in subsidiaries and affiliates (income from equity investees) |  |      | (2,318,115   | ) |      |  | (34,368      | )    |  |  | (706,710     | ) |  |      | (4,797,607 | ) |  |  | 810,752      |  
|                                                                             |  |      |              |   |      |  |              |      |  |  |              |   |  |      |            |   |  |  |              |  
|Pretax income from continuing operations before income from equity investees |  |      | (760,472,780 | ) |      |  | (280,538,692 | )    |  |  | (163,305,128 | ) |  |      | 2,334,646  |   |  |  | (102,955,488 | )
|Fixed Charges:                                                               |  |      | 102,681,154  |   |      |  | 78,209,471   |      |  |  | 55,279,289   |   |  |      | 76,835,796 |   |  |  | 68,271,089   |  
|Amortization of interest capitalized                                         |  |      | 210,354      |   |      |  | 159,885      |      |  |  | 117,744      |   |  |      | 84,403     |   |  |  | 171,694      |  
|Distributed income of investments shares                                     |  |      | 359,941      |   |      |  | 736,302      |      |  |  | 914,116      |   |  |      | 685,704    |   |  |  | 599,907      |  
|Interest capitalized in fixed assets                                         |  |      | (5,258,854   | ) |      |  | (3,997,121   | )    |  |  | (2,943,597   | ) |  |      | (2,110,075 | ) |  |  | (4,292,351   | )
|                                                                             |  |      |              |   |      |  |              |      |  |  |              |   |  |      |            |   |  |  |              |  
|Earnings                                                                     |  |      | (662,480,185 | ) |      |  | (205,430,155 | )    |  |  | (109,937,576 | ) |  |      | 77,830,474 |   |  |  | (38,205,149  | )
|                                                                             |  |      |              |   |      |  |              |      |  |  |              |   |  |      |            |   |  |  |              |  
|Amount by which fixed charges exceed earnings                                |  |      | 765,161,339  |   |      |  | 283,639,626  |      |  |  | 165,216,865  |   |  |      |           |   |  |  | 106,476,238  |  
|Ratio of earnings to fixed charges                                           |  |      |             |   |      |  |             |      |  |  |             |   |  |      | 1.01       |   |  |  |             |