Here's an image of an actual, on-track pass for the lead, with around 45 laps to go when Jimmie Johnson got around Jeff Burton.
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The last lead change happened in the pits
Sorry about the G stand fence.

I got to that stand, where my actual seat was located, around halfway through the race. By that time, the yellow shirts worn by the track's safety patrol were covered in black rubber dust, something the guys said they'd never seen before.
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The other interesting factor was the large number of empty seats:
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The hillside at the Mid-Ohio esses on the previous weekend looked more crowded than some of the Speedway's grandstands.