Jamie McMurray has the fastest practice speed during practice 1 of 186.780 mph for the 2017 NASCAR Cup Series Quaker State 400 at Kentucky Speedway.
The practice speeds table shows the fastest lap during practices.
|Driver||From Lap||To Lap||Average Speed|
|Martin Truex Jr.||33||42||182.608|
|Darrell Wallace Jr.||30||39||180.964|
Cars must run 10 consecutive laps on the track to be included in this table.