Consistent E.T's
Autos are nearly always going to be more consistent, but it isn't just the transmission that goes into it. It's weather, tune up, tire pressure in all 4 tires, tranny temp, water temp, oil temp, oil pressure, staging routine, and more.
It's one thing to run a number back to back, but a whole other deal to run the same number 4-6 times in a row, which many can do if the weather stays similar.