I'm willing to be corrected on this, but it's par for the course that lap times improve from Test Day to race week by at least a couple of seconds.
The cynic in me says it would look better from the LMH's point of view to make it look like LMP2 is "too close" on pace for as long as possible.
Maybe someone will go for a fast one at the end of the session, weather permitting.
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