Larson, who won at Richmond in fall 20 17, posted an average lap speed of 121.704 miles early in the semester that stood the entire 55-minute clinic.
Denny Hamlin (121.682 miles ) was second and Chris Buescher was third (121.638 miles ). Kyle Busch, looking for his third consecutive win at Richmond, was David Ragan completed the topfive.
Rounding out the Top have been Daniel Suarez, Martin Truex Jr., Kurt Busch, Kevin Harvick and Joey Logano.
There were not any OnTrack episodes during the semester.
Four drivers — Ryan Newman, Ragan, Larson and Jeb Burton — had to sit out the final fifteen minutes of this semester as all four teams were overdue to pre-race scrutiny last weekend at Bristol, Tenn..
Harvick missed the final half an hour of the session because his No. 4 Ford failed pre-race review three times last weekend.