I drive in town 95% of the time and get 16.9 to 17.8 mpg for the past 15500 miles. I drive a Journey but I should only get about 1 mg better than you at best. You are either driving a car that needs repair, your hammering it around town all day, or your driving with your parking brake on. My guess is you are just driving it too hard. 10mpg is way off of the norm!!

 

I can verify that after driving (and being passenger) in a AT G37 for roughly 400 miles yesterday, that we averaged 19.7 MPG.

We were NOT driving slow by any means... *cough* klumzyee *cough*

 

Guys,

From all your posts i gather something isn't right about my car. Its hard to believe that i drive so rashly that i can't even match everybody's worst figures...

I haven't been able to reset my ECU sucessfully. Will give it another try. Has anybody confirmed that the easy rest ECU scheme works on 2008 models?

 

I was able to reset ECU on my car successfully. Now comes the hard part. Driving like a granda.

I really hope this helps the mileage. I haven't found any othher way to deal with it otherwise.

 

There is the possibility that there's something wrong with your car.

One thing that can happen that will drastically affect fuel economy is an o2 sensor going bad.

I drive 100% city, accelerate quickly, and still get 300 miles per tank.

200 miles (on 14 gallons) is what I got with my last car, driving 100% city. (450hp 02 Trans Am heads/cam/headers, Ford 9" rear with 4.11 gears)

There's no way you should be getting that kinda economy, no matter what your ECU is doing.

 

So what should i do? Take it to a mechanic or Infiniti service?

Infiniti service told me that they found nothing wrong.

 

I drive a 2007 base G35.

 

Document your driving and fuel economy and bring it in. Find out exactly what fuel economy you're getting and compare that to what it "should" be getting.

Service depts are tough. "My car gets bad fuel economy" would be a hard symptom to combat. "We found nothing wrong" is service dept code for, "Your car threw no codes and drives fine."

It doesn't mean there's nothing wrong.

 

Have you checked it the old fashioned way with a calculator?

I'm sure you are feeling it at the gas pump but it may help to do it the old fashioned way and take that data to Infiniti as well.

 

It's all how you drive it.

I just got 340 miles to my first tank and the computer showed 20.2 mpg while it was all city driving.

I even had a few spirited full throttle pulls mixed in but the majority of the driving was done very little throttle, easy acceleration, and shifting at 1500 rpms.

Highway driving like this I'd assume 30 mpg is within reach.

 

There's only about 5-6 mpg difference city/hwy, if you drive 60mph. Even then, there's wind, elevation changes, etc....

 

Damn... how do you shift at 1500?!?!?! Even shifting at 2500 is hard for me...

 

I accelerate like a 60 year old woman but shift like a rally driver

I'm just following the Inifiti manual. It tells me to shift into 6th gear at 33 mph.

edit: Infiniti Instructions for the 6mt

The following are suggested vehicle speeds for shifting into a higher gear. These suggestions relate to fuel economy and vehicle performance. Actual upshift speeds will vary according to road conditions, the weather and individual driving habits.

For normal acceleration in low altitude areas (less than 4,000 ft)

1st to 2nd > 8 mph
2nd to 3rd > 16 mph
3rd to 4th > 25 mph
4th to 5th > 28 mph
5th to 6th > 33 mph

Following this makes for some BUSY work of the shifter and the rpm they want you to shift is 1500 but fuel economy is definately improved.

 

i just filled up my tank to the brim....got 308 miles....however when i got home after my 30 mile drive...it said 298....but other then that i get very poor fuel mileage

 

I've driven 50 miles since we talked yesterday (after resetting ECU). It consumed exactly 1/4 tank. This equates to 200 miles for a complete tank.