I have only been able to find a couple of threads lately about gas milage on for the IXs. Ever since I picked up my 06 IX MR. I have been getting about 14-15mpg that is about 50/50 high way city but it doesn't change much at all with all city or all highway. This hasn't really changed from it being all stock at first to now with very light mods. Back when I had my 03 VIII that running a little over 350hp I was getting 21 highway and just a bit less city.
Are all the IXs getting this kinda mileage or is it just mine and can you suggest anything to increase my economy.
Just lost my job so I need to save where I can, exceptionally if it shouldn't be this way, thanks for any help and im sorry if this has been asked a bunch already, I just couldn't find it and could use a point in the right direction, thanks

 

No that is not normal. You can try things like over-inflating your tires a few pounds. Take out any unnecessary weight (ie. junk in the trunk). Accelerate slower, smoother, and stay out of boost as much as possible. You can also get tuned for a little more economy. Good luck

 

That's roughly what I get for mileage on E85 at ~500whp. With pump at ~430whp I still get 18-22 depending on how much of it is highway driving.

 

15mpg means you're running way too rich. I'd check for boost/vacuum leaks, and maybe get a tune. Something is definitely wrong if you're getting that mileage.

 

I get 27mpgs on a 500whp 35r combo highway, but most of it is out of boost, which is crucial for gas milage.

 

^ what he said...
if you're getting 18 mpg you should keep your foot out of it because I used to average 28mpg on the highway prior to switching to e85

 

Unless your on E85 it iounds to me like you definitely have a boost and/or exhaust leak(s). It could also be an issue in your tune but I would definitely start with checking for leaks. Do you have a wideband?

 

well at least I know I can fix it and Im not stuck this way. The poor milage has been this way both with the stock exhaust and with my full 3" stainless. It was also this way before it had any tune on stock boost. The guy the car came from was one of those 30+ year olds that thinks he is 16 that thought he could be cool because he had a turbo.
I do have a plx wideband in but I still have not been able to figure out how to log with it though Evoscan with the tactrix 2.0
I do need a good tune real bad, just cant afford one right now. thanks for the info guys.

 

What AFR are you seeing during idle/cruising? Should be hovering around 14.7

 

are you throwing any code? maybe bad front o2 sensor?

 

while driving it is all over the place but one it warms up it sits about that while idleing

No Im not throwing any codes, I did when I first got the car but I cant remember what it was and I am just getting back to the car after not driving it for about 5-6 months. so my memory isnt the best. Also I am only running the front o2 now I have the rear turned off because of my exaust.

 

21-22 mpg on everyday driving with 400hp on 90oct.

 

Who tuned the car? Go ask them to give you a better drive ability map while you are out of boost.

 

You should be getting way more than that sheesh, i 2nd that your running too rich!

 

I have never tuned had the car tuned, I just used the ecuflash and evo scan to turn off the sensors that I got rid of like the rear o2 and I was going to play with the tune a bit but havent been able to since I cant log o2 and I cant really afford to screw things up since I am not that good at it.