Toyota commanded the third and final practice session ahead of the World Endurance Championship Six Hours of Spa, with its leading TS050 Hybrid lapping a second quicker than the nearest Porsche.
Having topped the previous two 90-minute sessions, Kazuki Nakajima maintained the status quo by setting a time of 1:55.233 seconds to head the order.
Driving the #8 car shared with Anthony Davidson and Sebastien Buemi, Nakajima edged out the sister #7 Toyota of Mike Conway/Kamui Kobayashi by just 0.005 seconds.
The Japanese driver's time was enough to eclipse the benchmark effort from qualifying last year by half a second.
Backing up the two regular-season Toyotas in third was the manufacturer's additional Le Mans entry, running in low-downforce trim.
Stephane Sarrazin turned in a time of 1:55.448s which put a gap of 0.2 seconds between the two different aerodynamic configurations.
Porsche's nearest challenge came courtesy of Andre Lotterer, who reeled off a 1:56.404s marker in the 919 Hybrid shared with Nick Tandy and Neel Jani.
That put Porsche 1.171 seconds off the pace heading into Friday afternoon's two-driver qualifying shootout.
In LMP2, G-Drive Racing driver Alex Lynn stole a march on the category after Vaillante Rebellion's Mathias Beche led most of the session.
A 2:01.708s best from Lynn edged out Beche's early figure by 0.262 seconds, with the #38 Jackie Chan DC Racing machine lapping third.
Ferrari ran first and second in the GTE-Pro class ranks, with Alessandro Pier Guidi recording a 2:14.904s best to pip stable-mate Sam Bird in the sister 488 by 0.196 seconds.
The pair of Ford GTs were next in line, some eight tenths off the pace of the lead Ferrari, with the #91 Porsche 911 RSR completing the top five.
Porsche junior Matteo Cairoli dominated GTE-Am for Dempsey Proton Racing, producing a time that would have been good enough to place third in the Pro field.
The morning run was truncated by a brief full course yellow period with 27 minutes to go, to clean up debris following minor contact between the #38 Jackie Chan DC Racing LMP2 and the Clearwater Racing GTE-Am Ferrari.
Only one other notable incident occurred during the session, when Bruno Senna had to come into the pits unscheduled after losing a wheel on his Vaillante Rebellion LMP2.
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