Unofficial test speeds from organizational Next Gen testing Dec. 15 and 17 for the NASCAR Cup Series on Charlotte Motor Speedway’s oval layout. Note that times are unofficial, with no technical inspection conducted before each session.
Day 2
RELATED: Day 2 overview | Scenes from Next Gen test
Unofficial speeds from third practice session (4-inch centered spoiler):
| Position | No. | Driver | Best Time | Difference | Best Speed | Team |
| 1 | 24 | William Byron | 29.979 | 180.126 | Hendrick Motorsports | |
| 2 | 6 | Brad Keselowski | 30.231 | -0.252 | 178.625 | RFK Racing |
| 3 | 19 | Martin Truex Jr. | 30.249 | -0.270 | 178.518 | Joe Gibbs Racing |
| 4 | 99 | Daniel Suarez | 30.278 | -0.299 | 178.347 | Trackhouse Racing |
| 5 | 8 | Tyler Reddick | 30.321 | -0.342 | 178.094 | Richard Childress Racing |
| 6 | 18 | Kyle Busch | 30.373 | -0.394 |
177.789 |
Joe Gibbs Racing |
| 7 | 47 | Ricky Stenhouse Jr. |
30.379 |
-0.400 |
177.754 |
JTG Daugherty Racing |
| 8 | 10 | Aric Almirola |
30.400 |
-0.421 |
177.632 |
Stewart-Haas Racing |
| 9 | 7 | Corey LaJoie |
30.429 |
-0.450 |
177.462 |
Spire Motorsports |
| 10 | 45 | Kurt Busch |
30.450 |
-0.471 |
177.340 |
23XI Racing |
| 11 | 42 | Ty Dillon |
30.535 |
-0.556 |
176.846 |
Petty GMS Motorsports |
| 12 | 22 | Joey Logano |
30.587 |
-0.608 |
176.546 |
Team Penske |
| 13 | 9 | Chase Elliott |
30.601 |
-0.622 |
176.465 |
Hendrick Motorsports |
| 14 | 14 | Cole Custer |
30.802 |
-0.823 |
175.313 |
Stewart-Haas Racing |
| 15 | 38 | Todd Gilliland |
30.824 |
-0.845 |
175.188 |
Front Row Motorsports |
| 16 | 2 | Austin Cindric |
30.861 |
-0.882 |
174.978 |
Team Penske |
| 17 | 21 | Harrison Burton |
30.920 |
-0.941 |
174.644 |
Wood Brothers Racing |
| 18 | 31 | Justin Haley | 31.125 | -1.146 |
173.949 |
Kaulig Racing |
Unofficial speeds from second practice session (6-inch centered spoiler):
| Position | No. | Driver | Best Time | Difference | Best Speed | Team |
| 1 | 8 | Tyler Reddick | 29.909 | 180.548 | Richard Childress Racing | |
| 2 | 24 | William Byron | 29.957 | -0.048 | 180.258 | Hendrick Motorsports |
| 3 | 6 | Brad Keselowski | 29.966 | -0.057 | 180.204 | RFK Racing |
| 4 | 47 | Ricky Stenhouse Jr. | 30.058 | -0.149 | 179.653 | JTG Daugherty Racing |
| 5 | 18 | Kyle Busch | 30.059 | -0.150 | 179.647 | Joe Gibbs Racing |
| 6 | 7 | Corey LaJoie | 30.158 | -0.249 |
179.057 |
Spire Motorsports |
| 7 | 31 | Justin Haley |
30.159 |
-0.250 |
179.051 |
Kaulig Racing |
| 8 | 22 | Joey Logano |
30.177 |
-0.268 |
178.944 |
Team Penske |
| 9 | 42 | Ty Dillon |
30.182 |
-0.273 |
178.915 |
Petty GMS Motorsports |
| 10 | 45 | Kurt Busch |
30.225 |
-0.316 |
178.660 |
23XI Racing |
| 11 | 99 | Daniel Suarez |
30.238 |
-0.329 |
178.583 |
Trackhouse Racing |
| 12 | 38 | Todd Gilliland |
30.472 |
-0.563 |
177.212 |
Front Row Motorsports |
| 13 | 14 | Cole Custer |
30.486 |
-0.577 |
177.130 |
Stewart-Haas Racing |
| 14 | 10 | Aric Almirola |
30.507 |
-0.598 |
177.009 |
Stewart-Haas Racing |
| 15 | 19 | Martin Truex Jr. |
30.577 |
-0.648 |
176.719 |
Joe Gibbs Racing |
| 16 | 21 | Harrison Burton |
30.565 |
-0.656 |
176.673 |
Wood Brothers Racing |
| 17 | 9 | Chase Elliott |
30.643 |
-0.743 |
176.223 |
Hendrick Motorsports |
| 18 | 2 | Austin Cindric | 31.141 | -1.232 |
173.405 |
Team Penske |
Unofficial speeds from first practice session (6-inch offset spoiler):
| Position | No. | Driver | Best Time | Difference | Best Speed | Team |
| 1 | 22 | Joey Logano | 29.572 | 182.605 | Team Penske | |
| 2 | 2 | Austin Cindric | 29.696 | -0.124 | 181.843 | Team Penske |
| 3 | 6 | Brad Keselowski | 29.722 | -0.150 | 181.684 | RFK Racing |
| 4 | 8 | Tyler Reddick | 29.726 | -0.154 | 181.659 | Richard Childress Racing |
| 5 | 24 | William Byron | 29.785 | -0.213 | 181.299 | Hendrick Motorsports |
| 6 | 9 | Chase Elliott | 29.957 | -0.385 |
180.258 |
Hendrick Motorsports |
| 7 | 45 | Kurt Busch |
30.016 |
-0.444 |
179.904 |
23XI Racing |
| 8 | 18 | Kyle Busch |
30.045 |
-0.473 |
179.730 |
Joe Gibbs Racing |
| 9 | 31 | Justin Haley |
30.074 |
-0.502 |
179.557 |
Kaulig Racing |
| 10 | 14 | Cole Custer |
30.109 |
-0.537 |
179.348 |
Stewart-Haas Racing |
| 11 | 47 | Ricky Stenhouse Jr. |
30.115 |
-0.543 |
179.313 |
JTG Daugherty Racing |
| 12 | 21 | Harrison Burton |
30.199 |
-0.627 |
178.814 |
Wood Brothers Racing |
| 13 | 19 | Martin Truex Jr. |
30.287 |
-0.715 |
178.294 |
Joe Gibbs Racing |
| 14 | 38 | Todd Gilliland |
30.312 |
-0.740 |
178.147 |
Front Row Motorsports |
| 15 | 99 | Daniel Suarez |
30.316 |
-0.744 |
178.124 |
Trackhouse Racing |
| 16 | 42 | Ty Dillon |
30.528 |
-0.956 |
176.887 |
Petty GMS Motorsports |
| 17 | 10 | Aric Almirola |
30.633 |
-1.061 |
176.280 |
Stewart-Haas Racing |
| 18 | 7 | Corey LaJoie |
30.743 |
-1.171 |
175.650 |
Spire Motorsports |
RELATED: Day 1 overview | Teams testing new configurations
Day 1
| Position | No. | Driver | Best Time | Difference | Best Speed | Team |
| 1 | 12 | Ryan Blaney | 29.668 | 182.014 | Team Penske | |
| 2 | 99 | Ross Chastain | 29.671 | -0.003 | 181.996 | Trackhouse Racing |
| 3 | 45 | Kurt Busch | 29.831 | -0.163 | 181.020 | 23XI Racing |
| 4 | 9 | Alex Bowman | 29.839 | -0.171 | 180.971 | Hendrick Motorsports |
| 5 | 8 | Tyler Reddick | 29.848 | -0.180 | 180.917 | Richard Childress Racing |
| 6 | 24 | William Byron | 29.851 | -0.183 |
180.898 |
Hendrick Motorsports |
| 7 | 47 | Ricky Stenhouse Jr. |
29.851 |
-0.183 |
180.898 |
JTG Daugherty Racing |
| 8 | 19 | Martin Truex Jr. |
29.936 |
-0.268 |
180.385 |
Joe Gibbs Racing |
| 9 | 6 | Brad Keselowski |
29.973 |
-0.305 |
180.162 |
RFK Racing |
| 10 | 10 | Aric Almirola |
29.984 |
-0.316 |
180.096 |
Stewart-Haas Racing |
| 11 | 42 | Erik Jones |
30.022 |
-0.354 |
179.868 |
Petty GMS Racing |
| 12 | 18 | Kyle Busch |
30.053 |
-0.385 |
179.683 |
Joe Gibbs Racing |
| 13 | 7 | Corey LaJoie |
30.059 |
-0.391 |
179.647 |
Spire Motorsports |
| 14 | 31 | Daniel Hemric |
30.096 |
-0.428 |
179.426 |
Kaulig Racing |
| 15 | 2 | Austin Cindric |
30.161 |
-0.493 |
179.039 |
Team Penske |
| 16 | 14 | Chase Briscoe |
30.327 |
-0.659 |
178.059 |
Stewart-Haas Racing |
| 17 | 21 | Harrison Burton |
30.336 |
-0.668 |
178.006 |
Wood Brothers Racing |
| 18 | 38 | Todd Gilliland |
30.370 |
-0.702 |
177.807 |
Front Row Motorsports |