I've mentioned F1 pit crews before, but they do things very differently. An F1 pit crew consists of about 20 people, including three to work the manual jacks (one is a backup at the front) and two to hold the car steady. There's also three on each wheel: one to take the old tire off, one to operate the wheel gun, an one to put the new tire on. F1 doesn't currently have in-race refuelling, and the same pit crew have to service both cars in a team, but that's generally only between one and three times in a race. Also, the cars mainly come in at staggered intervals rather than in a big group. With that many people, you can change four wheels in 1.92 seconds:
I'm not sure how reducing NASCAR pit crews from six to five will make things fairer. We'll have to wait and see.