on my 04 g35x i would get 300 on a tank in the summer, and about 250 in the winter. coupe mid pipe and a nismo cold air intake.

 

just want to give an update on this.... i now get around 370 miles on the same 17 gals after replacing spark plugs, i think they have paid for them self by now

 

LOL. Yeah, they might have been just a little worn out

 

I get between 250-300 miles a tank. For you people getting 300-400 HOW.?

I have jwt pop charger, ztube, plenum spacer. I always fill up premium. I really wish my car got better gas mileage.. I am getting ART pipes installed later today.. Not sure if that is going to increase or decrease or stay the same gas mileage.

Would a tune and all these mods help with gas mileage?

 

260-280 avg city/hwy

Highest ive gotten was 355 all highway.

 

I keep my foot off the gas, drive mostly highway. On the days when my foot is in it, I average 18-20 mpg.

 

Believe me, if you are getting 18-20mpg your foot is NOT in it. Or did somebody slip a 4-cylinder engine into your G?

 

Unfathomable. Liar!

 

must be something in the st Louis air haha. I get 18.5 average, and about 15 if I drive it like I bought it to.

 

+1. I got about 340 on a tank and that was about 97% hwy.

I have done the basics: plugs, air filter. I may dive into the O2s later this summer. I only get about 22mpg with 90% hwy.

FFFFUUUUUUUU When I dig in, I get much less than that.

Yeah, 25-28 is pretty effin high for the G. My altima (3.5) got about 24-26 Hwy.

 

At what point do you change spark plugs? I am currently at 56k miles i dont believe I have ever had mine changed.

 

whats the best way that you guys save gas to put it on triptonic or leave it in drive
?

 

Just recently I put 87 and my overall mpg has gone up. With 91 I was averaging 20.8 mpg. The 87 is getting me 23.2 mpg. I did notice that my mpg in the city with the 87 is worse than the 91 but freeway cruising (65mph -70mph) on 87 is much better. I do 40% city / 60% freeway. Only mods I have are the Stillen intake, grounding kit, lowered and light weight Rays 350z track wheels. I leave my car in drive and set it to trip just when I want to get on it. (1-2) times a day.

 

Cdub0619 has made a good observation. I am having the same experience with better milage with lower octane gas. I just like using 89 because I sense better throttle respose vs. 87.
The biggest difference between the octane levels is that lower octane gas burns faster than higher octane fuel. So, at constant highway speed and light throttle setting you (we) are probably burning more of the gas going into the cylinders. At low throttle you don't need the extra octane so the ecu is running like you have 91. Only if you step on it will the ecu retard the timing making for less efficiency.

 

hows it .i have an 02 skyline 250 gt. i get 1100 kms to a tank 60ltrs