Originally Posted by CypressMidWest

Meh, I agree that it does change. But I have seen guys (I have been among them) that can run in lower grip and then when the grip becomes very high, couldn't tune to compensate. The Main is gonna have equal to more grip in round 4, so the cars and drivers that do well in those conditions should be the ones racing for the Main imho. Plus as Jason Cheng stated, kinda makes it hard to try different set-ups round to round for fear of a botching a run or two.