Martin Truex Jr has the fastest practice speed during practice 2 of 198.385 mph for the 2017 NASCAR Cup Series Firekeepers Casino 400 at Michigan International Speedway.
The practice speeds table shows the fastest lap during practices.
|Driver||From Lap||To Lap||Average Speed|
|Dale Earnhardt Jr||22||31||195.294|
Cars must run 10 consecutive laps on the track to be included in this table.