What do you think is the most important takeaway from the first four races of the season utilizing the new aero package?
Jim: I actually have two. The first is, the package should have been run in a race last season to see how it performs in true race conditions. No matter what simulation you use, you cannot replicate the actions and decision-making of 39 other drivers (and their teams) in race ...Keep reading

Source: NASCAR Roundtable: Has the new rules worked well so far?