Mexico's state-owned Pemex's new oil refinery is processing crude at about 80% of its capacity, the country's president said on Thursday, an amount that marks a big jump from the company's latest official data.

The Olmeca refinery located near Mexico's Gulf coast port of Dos Bocas features a 340,000 barrel daily processing capacity, the largest of Pemex's seven domestic facilities.

"The latest report I have shows that it's more or less at about 80%," said Mexican President Claudia Sheinbaum, when asked about the refinery's current operations at her morning press conference.

Pemex's most recent data from the end of August showed the refinery running at about a quarter of its capacity, or about 84,100 barrels per day (bpd).

The Olmeca refinery was a top priority for Sheinbaum's predecessor, who sought to boost domestic refining.

The facility has suffered multiple delays coming online, and its $16.4 billion cost was more than double its initial price tag. Pemex's previous chief executive said it would be running at full capacity in August.

Earlier this week, Sheinbaum's new Energy Minister Luz Elena Gonzalez said Mexico is now producing 90% of the gasoline the country's motorists consume.

Pemex's August data showed that Pemex produced around 290,000 bpd of gasoline while importing nearly 417,000 bpd.