My RPM at this speed is around 2150~2200

However, according to MotorTrend, in the issue where they named the G35 MT car of the year. They indicated that at 60mph the RPM is at 1900...

Is there something wrong with my car?? Or MT misprinted their data?

 

Are you comparing your Sedan to the same vehicle? I believe both the Sedan and Coupe were included in COTY awards. The final drive ratio on the A/T is different from the f/d on the 6M/T thus giving diff. rpm's at the same speed.
Off the top of my head I can't tell you the ratios but the 6M/T is more overdriven than the A/T , so at the same speed the 6M/T (coupe) would tach a little less than the A/T sedan (or A/T coupe)
Seems to me my A/T coupe tachs about 2200 at 100kph-
Other factors include tire wear: As the tire wears down it effectively lowers the gear ratio (slightly) becuz of a smaller diameter, giving slightly higher rpm. Likewise when you change wheels and tires: if the replacement set-up is not identical to the stock sut-up, the rpms will be diff. too. Same reason> diff. diameter. Hope this helps, perhaps someone can add more..............

Gsedanman--in Silverstone Coupe clothing.

 

I am comparing my car (sedan 5spd AT) to the sedan in MT, also 5spd AT...

As I mentioned above, MT says 1900rpm at 60mph/100km... but mine's at 2150~2200....

 

So's mine. M/T misread , or misprinted..........

Gsedanman--in Silverstone Coupe clothing.