With both highway and city driving, I would only average 19 mpg with moderate gas pedal use vs 24 mpg in the c300, which is AWD. One month of strictly city driving with heavy gas pedal use I average only 13mpg... Yikes!
The G37 was not quiet at all. With regular driving I would hear rattles from the passenger seat (Very common problem from what I have heard) to road noise from bumps being very loud. Forced me to turn up the volume higher than usual.
While the Infiniti brand itself features high-end luxury cars for around 40k plus. They are owned by Nissan, monthly check gets paid to nissan, and in Japan, the Infiniti line is branded Nissan. All smoke and mirrors. Good reputation among young crowd...
Within my two year lease of my vehicle it has been brought it countless times for repair. Exhaust on the car was faulty and needed to be replaced twice. Apparently something was wrong with the resonators and it made a hideous metal pinging noise.