Jimmie Johnson has the fastest practice speed during practice 1 of 193.237 mph for the 2014 NASCAR Cup Series Duck Commander 500 at Texas Motor Speedway.
The practice speeds table shows the fastest lap during practices.
|Driver||From Lap||To Lap||Average Speed|
|Dale Earnhardt Jr||1||10||187.425|
Cars must run 10 consecutive laps on the track to be included in this table.