I just took my car in few days ago and I installed my Z intake duct after that. I am now noticing that my fuel economy seems to drop in a pretty significant figure. Maybe its because its hot outside and I am using AC but that doesnt seem to be reaosonable to me. Any ideas?

 

Yo,

I got the same issue but I realized it's definitely the A/C causing the fuel to get sucked. We had 2 weeks of 90 degrees plus in Chicago area a few weeks ago and I ran the A/C constantly. I got about 15.34 MPG average! I filed up last night and drove about 100 miles today and only sucked a 1/4 tank and I had no A/C running! I think the draw from the A/C on the engine is significant enough to get the MPG's down to 15 ish. Without it on, I get about 17+ city driving!

'03.5 G35 BS Sedan (I love that acronym!)
Stillen Intake, 350Z duct
Hyper-Ground Kit
Lowered!
Bulbs all around!
Splash Guards - Aero
Need Exhaust, Twin Turbo or NOS!

 

Could you be stepping on it a little more than usual to test your mod?

Take care

amG35
2003 Silver Sedan

 

Yeah, I've noticed I can swing between 14 and 18 mpg just by changing the amount of lead in my right foot.

2003.5 G35 Sedan Desert Platinum/Graphite Premium/Sport/Aero/Nav/Winter

 

I feel that since I put the 350Z duct on, followed by the Stillen
Hi-Flow Air Box, I don't care to listen to the radio or CD player.
My foot is always playing with my new musical instruments.
That is what is causing your fuel economy to suffer!

2003 Twilight Blue Sedan 5AT, sunroof, Graphite Leather,
splashguards, GG/DB red 10 wire Hypergrounding kit, 350Z intake duct, Stillen Hi-Flow Airbox