Porsche continued to hold the upper hand in Mexico after posting another 1-2 in the second practice session held on Saturday morning.
Brendon Hartley was the quickest driver with the Kiwi posting a 1m25.007 lap nearly half a second ahead of Nick Tandy in the no1 Porsche 919.
The no7 Toyota was third quickest but still 1.6 seconds behind the leading Porsches.
The LMP2 championship leaders in the no38 Jackie Chan DC Racing Oreca were quickest of the nine cars in the class with Ho Pin Tung posting a 1m33.390 lap, pushing Alex Lynn in the no26 G Drive Racing Oreca into second spot.
The no95 Aston Martin Racing Vantage was the fastest of the eight manufacturer cars in LMGTE Pro, with Marco Sorenson setting a 1m39.931, 0.2s ahead of his teammates in the no97 Vantage. James Calado set the third fastest time in the no51 AF Corse Ferrari, with the no67 Ford GT in fourth.
For the second time it was the no77 Dempsey-Proton Racing Porsche of Matteo Cairoli who set the pace with the young Italian posting a 1m41.536, 0.4 seconds ahead of Pedro Lamy in the no98 Aston Martin Racing Vantage.
Free Practice 3 will take place at 13h45 (local) / 20h45 CET later today, with qualifying following that at 17h50 / 00h50.