For the past 8+ years, many tracks in this game haven't had the treatment of getting refined down to a science. New York falls into this category because it stayed the same for many years, and the strategies were consistent and easy to do on pace.
10 months have passed, captains log, and New York now has new strategies. Before you get too excited, these strategies are not for the faint of heart and can be hard to master and time correctly, but, if performed properly can result in a faster time not only on the track but potentially beat the current USA% record!
While it's not surprising due to the sheer amount of precision that's needed to optimally position the car here, I'll show a breakdown of what's different:
Entire Map: LAP 1
N = Nitro Spot
Bumps = wait 2 seconds and Boost, when you are in the middle of both. You should be able to keep 228 MPH on the downhill when entering LAP 2 -> https://www.speedrun.com/top_gear_2/guides/qmy9n