even Bonneville land speed record attempts have to make a second pass within a certain time frame (20 minutes?) of the first run.
I believe they do it in the opposite direction to rule out wind speed/direction and the second run must be within 1 % of the first run (if it was faster) to be an official record.
Not that you could do that at a 1/4 mile track, but still some kind of back up run is usually a good idea when several say it sounds too good to be true
The night I got my best run (13.898) I had another 13.928 second slip, and one at 14.001.
1st run (right lane)
2nd and 3rd run