Hints and tips:
...But Pemex said upgrades to its six refineries were bearing fruit: refinery output rose to 635,000 b/d compared with 542,000 in the first quarter....
...Refinery output was 580,400 b/d in February; Mr López Obrador claims it has since risen to 800,000 b/d....
...b/d — a level last reached in 2004....
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