I was driving in LA (Los Angeles) traffic, stop and go for about an hour and noticed the gauge reading around 200F (93C). Since it's a new car, wasn't sure if this was norm.
Could it be that there was a general consensus that 350 & 370 model # was an indication of the displacement and that calling it the 400Z would be misleading? So IV is #4. Mystery solved.
Read your post in the morning. I haven't seen one even in a large city like San Diego, CA. I just saw my first one (other than mine) iat our local tennis club parking lot. Sorry, no picture.