What??!! lol You need to open her up more..

 

Danny, I hope you are right. Mine is not showing any improvement 0-500 miles still 9.4-10.4 average.

 

I highly doubt that this is a result of it being a green engine. I mean a new engine isn't going to avg 10mpg when the car should be getting at least 15. I mean we're talking a 10mpg shift after 1200 miles... I think I avg'd like 21 when i first got it. after about 3000 miles It was down to 17-18. I mean seriously unless your're shifting above 5k, you should be getting at least 14-15

I would check the normal things like engine temp/engine oil/tire pressure. I would imagine if the A/F was off the car CEL would be thrown.


if it doesn't improve you have grounds to go turbo =) I would say saving 5-800 bucks a year justifies it. =P

 

I got 10 MPG once..in a Track day....

 

Better than expected. 2009 G37 with 8,000 miles.

Drove from Atlanta to Tampa over the weekend. I reset the computer before leaving and checked the mileage using miles/gallons at fill up in Tampa.

Atlanta to Tampa (AC off)
Avg Speed: 74mph
29.5mpg (manual calculation: 30.1)

Tampa to Atlanta (AC on)
Avg Speed: 76mph
28.7mpg

I've been averaging around 21mpg back and forth to work (17 miles of mixed driving).

 

I have had my 2009 G37x sedan for about six weeks now and I'm averaging 18-19 mixed driving I-5 urban

 

I have 3500 miles on my g37 sedan and have averaged 20 mpg since day 1 in mixed driving. I drive 18 miles each way to work and always get 20 mpg give or take a couple of tenths. I have not taken any long trips so I don't have any highway mileage numbers. My driving has been mostly with AC off since it has been cold in Georgia since I bought my car in October.

 

I got 18-19 mpg so far. Currently on my second tank of gas and my G37 has 500 miles. lots of short distance driving--I drive 1.5 miles one way to a bus station at least three days a week. On weekends, many short distance trips too. since I'm still break in on my G37, I'm pretty mild on the gas pedal. haven't taken any long distance trip yet.

I think 18-19 mpg on break-in is good enough. I averaged 20-21 mpg on my old 98 I30 on short distance driving. I got 27-28 mpg on my old car on highway though. (FYI: this 2010 G37 is 400 lbs heavier than 98 I30)

 

my vegas trip. 29.6 mpg. avg about 77 mph

way back 26.9 mpg


did not use cruise control

 

I just got the car about a week ago and I am getting 11.5 mpg in mostly city driving. I hope it will improve a lot.

 

Maybe if you drilled another hole in it it will get better mileage?

(Sorry Greg, couldn't help myself, it's your car, drill and hammer as much as you want my friend!)

 

mine did the same thing when it was new, now it's "normal".

 

Mine was never that bad. I think my worst recorded MPG is my first tank, which was 17.8. I obviously didn't floor it since I wanted to break the engine in. Ever since then, my average is about 20-22mpg, although a good amount of that is highway. Highest I ever got was 26mpg, but that was almost all highway. Definitely something wrong with your car (or you) if you're getting 10mpg.

 

if your doing mostly city driving that's pretty normal i get anywhere from 9-12 mpg in the city and mixed of mostly highway ill get around 15-19mpg

 

How do you reset it? My computer in the center of like the MPG and **** says 18.5, I go to the info stage where the navi is located and reset it, but the trip computer still says 18.5???