Bad mileage after tune, headers and exhaust - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

TECADON · 07-24-2013, 03:47 PM

Another thing is DFCO (Deceleration Fuel Cutoff) in the tune, I see some tuners turn this off, and I have played with mine and lost about 2mpg when driving through town a lot with it off. There are a lot of factors that can cause MPG changes so I would not be too concerned.

I can say though my MPG got better after my mods, but I don't have headers yet, but I cant see it causing a MPG decrease really.

Birm · 07-24-2013, 05:03 PM

Quote:

Originally Posted by khanh

Hi,

I have a very bad mileage after tune, headers and exhaust.
Before that a have about 15-16 in the city with very light foot. Now I have 13 with very light foot. The same route. And when I stop the car for a while, mpg decrease very quickly by not moving. For example I have 14 at the moment and after 3 minutes of not moving it drops to 13. Does it mean that car has worst mileage when idle than when it moves?
What could be wrong?

Thank you.

2012 SS M6

This isn't bad it's normal. And if you are sitting there idling how would you possibly be getting any "miles per gallon"? Your car is still running is it not? Therefore burning gas is it not?

It's normal. Enjoy your car. If you're worried about MPGs you; A) need to buy a Prius and B) stop modding

MrGs SS · 07-24-2013, 08:56 PM

I just installed headers, and got the car dyno tuned, the car runs great.. I couldn't be happier. As far as mileage is concerned.. One I figured out how to change the display I stopped caring, not that I did before I changed it.. lol

PAUL SS · 07-24-2013, 09:07 PM

Worse fuel mileage because you can't keep your foot out of it, It's just too much fun!

J-ROD-210 · 07-24-2013, 09:19 PM

I have a JRE tune. I have not reset the mpg in a year or so and displaying 17.6. It used to be exactly 16 before headers and tune. I guess Jannetty is a magic tuner. I tend to have a lead foot too

2SSRSinBama · 07-24-2013, 10:04 PM

i disabled AFM, tuned my car, and gained a mpg with mods, lol

07-24-2013, 03:47 PM	#15
TECADON Drives: 2011 Camaro 1SS/RS Join Date: Dec 2012 Location: Hampton, VA Posts: 96 View My Garage	Another thing is DFCO (Deceleration Fuel Cutoff) in the tune, I see some tuners turn this off, and I have played with mine and lost about 2mpg when driving through town a lot with it off. There are a lot of factors that can cause MPG changes so I would not be too concerned. I can say though my MPG got better after my mods, but I don't have headers yet, but I cant see it causing a MPG decrease really. __________________ __________________ 2011 SS/RS Homemade CAI, Doug Thorley Muffler Delete, Burns Stainless X-pipe and Dynomax Race Bullets, 8k HIDS and Fogs with harness, Tuned by Me on HPTuners Yes its quick...quicker then you think!!!

07-24-2013, 08:56 PM	#17
MrGs SS Drives: 2013 Black SS/RS Join Date: Dec 2012 Location: Florida Posts: 126	I just installed headers, and got the car dyno tuned, the car runs great.. I couldn't be happier. As far as mileage is concerned.. One I figured out how to change the display I stopped caring, not that I did before I changed it.. lol __________________ 2013 2SS Black~ L99 Performance Mods-CAI intake, APEX washer bottle relocate and scoop, Ported TB. SLP 160 degree stat, Norris Catch-can, Pfadt Tri-Y headers, BMR F/R sway bars and Arms, Corsa cat back exhaust. Appearance Mods-Blackout kit (markers, tail lights), black tail light bezels, black chrome trunk lettering, LSR billet engine dress-up kit, sub box. Billet tensioner pulley and thermostat housing (Billetcustom), Heritage grille. Tuned by Matt @ Florida Speed and Power 379/388 Mustang dyno

07-24-2013, 09:07 PM	#18
PAUL SS The Mark of Excellence Drives: 2010 ABM 1SS RS LS3 Join Date: Jan 2009 Location: Smallest State in the Union Posts: 8,690 View My Garage	Worse fuel mileage because you can't keep your foot out of it, It's just too much fun! __________________ BMR, CAI, DynoMax, Elite Eng., Hurst, Jannetty, Clear Image Headers & Hi Flow cats, Jet Hot, LSR, TSW, VMax, Vredestein

07-24-2013, 09:19 PM	#19
J-ROD-210 Drives: 2010 Camaro SS/RS RJT A6 Join Date: Jul 2011 Location: San Antonio,Texas Posts: 675	I have a JRE tune. I have not reset the mpg in a year or so and displaying 17.6. It used to be exactly 16 before headers and tune. I guess Jannetty is a magic tuner. I tend to have a lead foot too __________________

07-24-2013, 10:04 PM	#20
2SSRSinBama Drives: 2010 2SS/RS Camaro CGM Join Date: Aug 2011 Location: "The Shoals" Alabama Posts: 767	i disabled AFM, tuned my car, and gained a mpg with mods, lol __________________ 2010 Camaro SS L99... has a few mods