i just bought a 2006 g35 coupe with 50k and its been giving me really bad gas mileage... city i get like 130 miles to a tank highway ill get maybe 200 if i drive easy. I took it to the dealer and they said the previous owner skipped the 30k service and the dealer recommended that i get the 60k service now since i havent had the 30k service... will the 60k service help?? and what can i do to fix the mpg's?

 

Go to autozone and have them pull any codes in the ECU

Run 1 can seafoam in the gas tank
Use K&N air filter
Change spark plugs to NGK Laser Platinum
Change tranny fluid - OEM
Change Diff fluid - Mobil 1 75w90
Change oil at 3000-5000k depending on UOA results
Cabin Filter


I have a 05 6mt revup engine w/ 82k miles and get about 300-350 miles to a tank and usually 75 miles per quarter tick on the cluster. (70% city, 30% highway)

 

Crazy. Even if the previous owner didnt do a 30k tune-up, that is just too low. I mean getting under 10 mpg!?!?

 

^^ this...

Keep the car maintained as well as possible.

I have an 04 with 90k miles. I get 400-450 per tank regularly. 50% mix city/hwy.

 

Wow i'm getting real bad MPG too then. I only get like 225ish per tank, 80% city 20% hwy

 

I used to average 9 MPG in Los Angeles... I mean when you drive like 7 miles in 1.5 hours it sort of makes sense... I'd say drive easier in the city, it'll save tons of money in the long run.

And Calamity: No, you're doing okay. PAIXAO has a sedan, you have a coupe. coupes get SIGNIFICANTLY worse mpg for some reason. Even though I think the numbers don't really say that, there was a thread on here a year back that said something to that effect

 

What RPM do you shift gears at? Any after market parts?

 

i have an 05 coupe with 34k miles and ive done the 30k service and i get an average 260 miles per tank(except on my 8 hour trip to myrtle beach where i got like 400 with 1 tank)

 

Our cars get terrible city milage, unless your like me and cruise at 40 in 6th lol

 

I was talking to the guys at Jim Wolf Technologies about these specific cars and MPG (I live 2 minutes from their shop) he was telling me that it takes these engines like 10-15 minutes for every part to fully warm up and go into a closed loop system. I drive 3 minutes at most to work and back 50% street and 50% highway. Every time I go to lunch I drive for a few minutes as well. This he said explains why i Avg 15mpg at best. I don't drive it enough to let it get to a closed loop state so it is a good bit more inefficient this way. He was saying that another guy that works there drives his Nissan Titan 4 miles to work and back and also gets nasty mpg. Same reason.

 

Makes sense. Thats what my problem probably is too. To/from school is only like a 5 minute drive and i usually floor it the whole time to blow off steam lol

 

I don't know that seems weird. I drive 80 percent city in my 03 with 89k miles and get about 330-375 a tank. I thought that was bad!

 

Some of you guys got crazy mileage issues.

I have a TT G35 and drive mostly city... I will still get about 16mpg. *shrug*

 

I Average 25 mpg with a commute of city and highway...i just cruise control it on the highway.

 

Yep, often times when I get to work my temp gauge isn't even at where it is in normal operation. Or when I go grab some lunch, I get to the location, usually 2-3 miles to the mall, and the gauge is still low. I had a physics class when i went to the university and the professor said for a gas engine to be near 100% efficient it would have to run around 450ºF