You don't experience any knocking/pinging as a result of running 87? Figured the high compression engine would be pretty pissed about having regular thrown at it every time.

 

I used to average 13-15 MPG with my G. I average 10-12 now in the city with the Q60. Driven well.

Overall I've noticed these cars just like to drink gas if you drive them hard.

 

You're my hero Telcoman.

I get about 15.5MPG average for the last year or so. To note, I only drive the G on the weekends now and I tend to drive it harder so, something is definitely up with your car. I suggest replacing the fuel filter then inspect, clean or replace your injectors and intake filters.

 

No traffic. Just short drives 15 min or less. 30 miles a day .

 

This.

My 07 Nismo 350z 13.5 -14 as well. HARD DRIVES

 

My '94 Sentra SE-R 2.0 gets about 13 mpg on a road course race track, mid-20s on street in mixed traffic. I no have problem seeing y'alls crappy mileage driving hard on the street with a 3.7L, somewhat portly G.

 

My filters are about 2 weeks old. I'll clean the injectors today and see if there is any change over the next few days. I'll let you know if there is improvement.

 

if it help, my 17 q50 3.0t average about 15mpg all city driving. I had a nissan before and it averaged 10mpg. Nissan/Infiniti gulp gas.

 

I average about 22mpg mixed driving. My lowest over a tank I think was like 21.2 or something to that effect. How you drive definitely makes a difference...as does AT vs MT. I am a 6MT

 

Have you checked the air/fuel ratio? Maybe you're running really rich. The only thing I can think of is the injectors or a messed up maf sensor.