This may not belong here either. The question about diesel fuel in Mexico comes up on this forum almost weekly. There are no hard and fast answers. Some diesel in Mexico comes from the US. Much of it goes to the major cities - Mexico City - Guadalajara - Monterrey. Some goes to stations near the US border. Some goes to Northern Baja. Mexico is working to upgrade their refineries but it could be years before they are up to today's standards. Posts on this forum have been predicting in a year or so since 2010 - not yet. I tried to find more online. Much of what I find is about gasoline but there are some things about diesel. Mexico imports a lot of fuel from the US but it is difficult to determine how much of it is diesel. Lots of stories online where info can be found. Still no real answers. Don't count on ULSD for at least a couple more years. That said - lots of RVers have been going to Mexico for years with newer diesel trucks built for the US market.
http://www.reuters.com/article/us-mexico-usa-oil-insight-idUSKBN14B0FS
Pemex faces a further cut of around $5.36 billion in 2017, which hurts its ability to improve refinery output. Refineries in Mexico are running at about 60 percent of their 1.576 million bpd of capacity, according to the company's data. That leaves the onus on Pemex to import more to cover demand.
Mexico's fuel demand is around 2.04 million bpd and the government expects growth of 2-3 percent per year in coming years.
In September, Mexico's imports of U.S. fuel surged to a monthly record of about 960,000 bpd, according to the EIA. The average for the year-to-date is around 820,000 bpd.
"We are expecting Mexico's imports from the U.S. to increase to an average of 900,000 barrels per day (bpd) in 2017... imports would surpass 1 million bpd at times in 2017 if private imports become significant after price liberalization," said Robert Campbell, head of oil products research at Energy Aspects.
https://www.eia.gov/dnav/pet/hist/LeafHandler.ashx?n=PET&s=M_EPOORDB_EEX_NUS-NMX_MBBL&f=M
U.S. Exports to Mexico of Biomass-Based Diesel Fuel (Thousand Barrels)
http://www.opisnet.com/events/mexicosummit/news.html
Diesel demand is expected to increase by 65% from 2015 to 2029 from 408,500 b/d to 672,500 b/d, he said.
https://rbnenergy.com/taxonomy/term/430
http://www.cnbc.com/2016/12/29/us-refiners-export-record-amounts-of-gasoline-diesel.html
http://www.freshplaza.com/article/167808/Mexico-Diesel-shortage-hits-avocado-exports