Hi, I think you'll be fine with the 18"s. I find that going a bit slower on the problem highways here is the best way to deal with the road conditions. I use the GCP (east of LGA) and the Northren State as much as possible, mostly to avoid those damn sand trucks on the LIE and the crazed Taxi and Limo's on the Van Wyck. The BQE at right time of day could be fun
either way the car is amazing....enjoy!
bob