gas mileage..

02v6staang · July 4th, 2009, 03:45 PM

So the case is that im getting horrible gas mileage. Around 80 miles to half a tank. I have replaced the fuel filter, had an injection cleaning..gas treatment. Nothing changed. I currently have full exhaust (longtubes & catted h), intake spacer, 3.73's & t-lok, sct tuner, cai. any ideas??

Big Daddys Stang · July 4th, 2009, 05:10 PM

Check your spark plugs,oil, tire pressure even if they look ok.
Aftermarket wheels? Try filling on good brand stations like Shell for ex. Are those stats from highway/city? How is the idle? Do you smell fuel when you get into the car and start it? Do you drive it hard?
Try seafoam.....

GreenFaleen · July 4th, 2009, 07:40 PM

drive with less foot lol

Brian147 · July 4th, 2009, 07:52 PM

Originally Posted by 02v6staang

So the case is that im getting horrible gas mileage. Around 80 miles to half a tank. I have replaced the fuel filter, had an injection cleaning..gas treatment. Nothing changed. I currently have full exhaust (longtubes & catted h), intake spacer, 3.73's & t-lok, sct tuner, cai. any ideas??

Are there any oxygen sensors on your setup? If so are they located in the same spot as they were factory? If so are they old or new oxygen sensors?

-If you have no sensors you will be dumping fuel
-If they are not in the same location this can cause the computer to run lean
-If they are old sensors they could be shot (they dont need a service engine code for that to happen)

ApeXX · July 4th, 2009, 09:01 PM

I've noticed decreased gas mileage in my Mustang also... Although I have to say it certainly isn't THAT bad!

01VBmustang · July 4th, 2009, 09:31 PM

I was getting about the same mileage lup until ast week, but i was also smelling fuel when the car was running and right after i had been driving around.

Looked at my filler neck for the gas tank and there was a leak in it.

Got it fixed and I am still on my first fillup since, 148miles and just below a half tank.

6er_w/a_Vengance · July 5th, 2009, 12:06 AM

ive heard that gears can cut down on gas mileage, but not by that much...

ApeXX · July 5th, 2009, 01:40 AM

Originally Posted by 6er_w/a_Vengance

ive heard that gears can cut down on gas mileage, but not by that much...

From what I understand 3.73's and 4.10's both hurt gas mileage to varying degrees. Since you'll be highway cruising at higher RPM's, your bound to lose some gas mileage regardless of what gears you install. It's my understanding that 4.10's hurt the most, seeing as they are steeper gears.

01VBmustang · July 5th, 2009, 02:08 AM

On a 3-3.5 hour trip from virginia beach to JMU doing 70-80 the whole way i got around 23 to 24 mpg. My filler neck may have been leaking a little back then, not sure, because i just got i replaced last week.

orson250 · July 5th, 2009, 11:41 AM

i have heard of people who had mpg issues after they installed the lt's. i second the motion to check the location and condition of the O2 sensors. not saying this is definitely related to the lt's, but it might be since it's aftermarket

04mustang232 · July 5th, 2009, 03:28 PM

id sea foam the engine through a vacuum line to clean your egr, and your o2's

02v6staang · July 5th, 2009, 08:31 PM

I have drove the car with less foot. slow take offs and its stil the dame. I didnt notice the mpg loss until after my longtubes...so its definately not rly the gears. Ive done a recent tune up, so the spark plugs are good. I had it on the dyno and the a/f ratio is dead on. So i have some o2 extenders i will try Hopefully that helps.

04mustang232 · July 5th, 2009, 09:45 PM

what did you dyno at? (not to change the subject)

getchapull · July 6th, 2009, 01:23 AM

lol it sounds like bullshit, but read the manual about good driving tips. im getting an average of 20-22 mpg in the city with good driving habits plus keeping the car well maintained

July 4th, 2009, 03:45 PM	#1
02v6staang Regular 2003 mach 1 Join Date: Mar 2008 Location: Dfw Texas Posts: 189	gas mileage.. So the case is that im getting horrible gas mileage. Around 80 miles to half a tank. I have replaced the fuel filter, had an injection cleaning..gas treatment. Nothing changed. I currently have full exhaust (longtubes & catted h), intake spacer, 3.73's & t-lok, sct tuner, cai. any ideas?? __________________ Mach 1: PHP intake spacer, JLT ram air intake, flow 40 weld ins v6ual exhaust, mac longtubes, catted h, flow 40's, 3.73's & t-lok, k&n intake, Xcal3, VAP intake spacer, MGW short shifter, 03/04 cobra rims, eibach pro-kit

July 4th, 2009, 07:40 PM	#3
GreenFaleen MM's Resident Ricer 2006 Scion tC 13.9@103/8.9@81 Join Date: Nov 2006 Location: Raleigh/Lenoir, NC Posts: 9,841	drive with less foot lol __________________ Scion Tc Turbo - 9psi 297whp 287wtq 2500lbs :p MM 4 Banger club: Senior Ricer NCMM #9 "Horsepower sells cars, torque wins races." -Carroll Shelby

July 4th, 2009, 09:31 PM	#6
01VBmustang Regular 2001 Mustang Convertible Join Date: Jan 2008 Location: Virginia Beach Posts: 135	I was getting about the same mileage lup until ast week, but i was also smelling fuel when the car was running and right after i had been driving around. Looked at my filler neck for the gas tank and there was a leak in it. Got it fixed and I am still on my first fillup since, 148miles and just below a half tank. __________________ BBK CAI. H pipe/dual flows. 4.10s and tlok. window tint. Bullits. SCT Tuner.

July 5th, 2009, 12:06 AM	#7
6er_w/a_Vengance Sonic Blue FTGDMFW!!! 2004 Mustang v6 Join Date: Apr 2007 Location: Portland, TN Posts: 3,710	ive heard that gears can cut down on gas mileage, but not by that much... __________________ 2004 Mustang 3.9 v6 K&N - Flowmaster Original 40s Catback - 5k HIDs - Alot of blacked out stuff - Show car shine 24/7 Fuckers

July 5th, 2009, 02:08 AM	#9
01VBmustang Regular 2001 Mustang Convertible Join Date: Jan 2008 Location: Virginia Beach Posts: 135	On a 3-3.5 hour trip from virginia beach to JMU doing 70-80 the whole way i got around 23 to 24 mpg. My filler neck may have been leaking a little back then, not sure, because i just got i replaced last week. __________________ BBK CAI. H pipe/dual flows. 4.10s and tlok. window tint. Bullits. SCT Tuner.

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July 4th, 2009, 05:10 PM	#2
Big Daddys Stang Hardcore Enthusiast 2000 V6 Join Date: Apr 2009 Location: San Diego, CA Posts: 1,904	Check your spark plugs,oil, tire pressure even if they look ok. Aftermarket wheels? Try filling on good brand stations like Shell for ex. Are those stats from highway/city? How is the idle? Do you smell fuel when you get into the car and start it? Do you drive it hard? Try seafoam.....

July 4th, 2009, 09:01 PM	#5
ApeXX Regular Join Date: Jun 2009 Posts: 69	I've noticed decreased gas mileage in my Mustang also... Although I have to say it certainly isn't THAT bad!

July 5th, 2009, 11:41 AM	#10
orson250 Regular 2003 mustang v6 232rwhp@7psi Join Date: Jul 2007 Location: jackson, MS Posts: 245	i have heard of people who had mpg issues after they installed the lt's. i second the motion to check the location and condition of the O2 sensors. not saying this is definitely related to the lt's, but it might be since it's aftermarket __________________ V0rTech'D

July 5th, 2009, 08:31 PM	#12
02v6staang Regular 2003 mach 1 Join Date: Mar 2008 Location: Dfw Texas Posts: 189	I have drove the car with less foot. slow take offs and its stil the dame. I didnt notice the mpg loss until after my longtubes...so its definately not rly the gears. Ive done a recent tune up, so the spark plugs are good. I had it on the dyno and the a/f ratio is dead on. So i have some o2 extenders i will try Hopefully that helps. __________________ Mach 1: PHP intake spacer, JLT ram air intake, flow 40 weld ins v6ual exhaust, mac longtubes, catted h, flow 40's, 3.73's & t-lok, k&n intake, Xcal3, VAP intake spacer, MGW short shifter, 03/04 cobra rims, eibach pro-kit

July 6th, 2009, 01:23 AM	#14
getchapull Newbie 1998 Mustang V6 Join Date: Jun 2009 Location: Dallas Posts: 14	lol it sounds like bullshit, but read the manual about good driving tips. im getting an average of 20-22 mpg in the city with good driving habits plus keeping the car well maintained

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