Single Chamber Flows kills gas mileage? True/False? - 2003-04 Mach 1 Registry Owners Club

Warrior4Christ · 08-09-2009, 03:24 PM

Hey fellas,
I am blessed to have an 04 black Mach 1, with o/r bassani x-pipe with super 44 flows dumped/turn-downs. All summer long I have been getting about 17mpg avg until 2 weeks ago I installed a JLT cold air intake, and this brought me up to almost 20mpg for the first two tanks of gas. Last week I replaced the super 44 flows with single chamber flows and now all of a sudden my gas mileage is now at about 16mpg... What gives? Is it known that single chamber flows kills your gas mileage or do yall suggest I check into another aspect of this gas mileage. I know that single chamber flows are considered racing mufflers but I didnt think it would kill the gas mileage as much as it has. What should I do to improve my gas mileage? Thanks in advance for yalls advice.

White04Mach · 08-09-2009, 03:43 PM

I have original 40 weld in Flows and pulled 27 mpg going to Myrtle Beach. My previous best with bone stock mufflers was 25.

gbranton · 08-09-2009, 04:25 PM

If you haven't had it done your car probably needs to be tuned with those mods. Mine ran worse after a Magnaflow catback and a C&L cold air until I got it tuned.

MUSCLEMUSTANG65 · 08-09-2009, 04:31 PM

I have heard that singles are worse than other mufflers for flow. I cold see where that might effect mileage. From what i hear magnaflow has the best flowing mufflers but they are alot quieter.

wutang61 · 08-10-2009, 12:38 AM

for the most part all aftermarket mufflers reduce back pressure.

less back pressure,air flows more freely,more efficient motor,better MPG

true some more then others but ive never heard of a aftermarket exhaust part costing mileage... in fact improving mileage is a major selling point next to horsepower.

your right foot will be the only thing that effects mileage negatively after a exhaust mod.

mad_max_86 · 08-10-2009, 02:19 AM

all I know is my mach gets on average 16-18 MPG, but I drive her everyday, 80% in town and have never ran a full tank of gas through her on highway only.

Fenixfire · 08-10-2009, 12:34 PM

My Mach got 23 mpg city consistently with 4.30 gears, magnaflow magnapack catback, bassani catted x pipe, 3/8 inch intake spacer as the only mods and i was on the stock tune. I dont know what the highway mileage would have been as I never took her on a road trip. My guess would be 23-25 because of the 4.30s dont do so well on highway.

Furinox · 08-10-2009, 01:39 PM

wouldnt make a noticeable difference. It's how you're driving or soemthing else

mach1metalhead · 08-10-2009, 11:32 PM

get tuned and report back, though it's probably just too much fun with the loud pedal

08-09-2009, 03:24 PM	#1
Warrior4Christ Registered User Join Date: Jun 2008 Location: Dallas, Texas Posts: 25	Single Chamber Flows kills gas mileage? True/False? Hey fellas, I am blessed to have an 04 black Mach 1, with o/r bassani x-pipe with super 44 flows dumped/turn-downs. All summer long I have been getting about 17mpg avg until 2 weeks ago I installed a JLT cold air intake, and this brought me up to almost 20mpg for the first two tanks of gas. Last week I replaced the super 44 flows with single chamber flows and now all of a sudden my gas mileage is now at about 16mpg... What gives? Is it known that single chamber flows kills your gas mileage or do yall suggest I check into another aspect of this gas mileage. I know that single chamber flows are considered racing mufflers but I didnt think it would kill the gas mileage as much as it has. What should I do to improve my gas mileage? Thanks in advance for yalls advice.

08-09-2009, 03:43 PM	#2
White04Mach Stab n' Steer! Join Date: Jun 2008 Location: Carey, Ohio Posts: 1,137	Re: Single Chamber Flows kills gas mileage? True/False? I have original 40 weld in Flows and pulled 27 mpg going to Myrtle Beach. My previous best with bone stock mufflers was 25. __________________ 2004 White Mach 1, 5 Speed, IUP 18k miles Sold 01/10/15 Ford C springs, MM Adjustable lower control arms, DD Mach rims, Honeycomb panel, sequential turn signals, modded Bullitt skirts, wingless decklid, Cobra mirrors, Flowmaster 40's, Fiore quadrant and firewall adjuster, 4.10's, Shelby diff cover, MGW shifter, Raptor shift light.

08-09-2009, 04:25 PM	#3
gbranton Speaking Cherry Red Join Date: Oct 2003 Location: Mobile, AL Posts: 3,476	Re: Single Chamber Flows kills gas mileage? True/False? If you haven't had it done your car probably needs to be tuned with those mods. Mine ran worse after a Magnaflow catback and a C&L cold air until I got it tuned. __________________ 2003 Azure Blue Mach 1 10/15/03 - 12/23/10 1986 GT with T-tops (black)

08-09-2009, 04:31 PM	#4
MUSCLEMUSTANG65 Registered User Join Date: Oct 2007 Location: WOODVILLE, AL Posts: 700	Re: Single Chamber Flows kills gas mileage? True/False? I have heard that singles are worse than other mufflers for flow. I cold see where that might effect mileage. From what i hear magnaflow has the best flowing mufflers but they are alot quieter. __________________ 2002 saleen S281SC

08-10-2009, 12:38 AM	#5
wutang61 CAT MASTA! Join Date: Jun 2007 Location: Vero Beach, Florida Posts: 3,406	Re: Single Chamber Flows kills gas mileage? True/False? for the most part all aftermarket mufflers reduce back pressure. less back pressure,air flows more freely,more efficient motor,better MPG true some more then others but ive never heard of a aftermarket exhaust part costing mileage... in fact improving mileage is a major selling point next to horsepower. your right foot will be the only thing that effects mileage negatively after a exhaust mod. __________________ 04' Torched *6-speed* Build Date: 02/25/2004 Ported Eaton @7psi Viper T-56 Built 8.8,4.10's 441/402

08-10-2009, 02:19 AM	#6
mad_max_86 DSG Mach Won Join Date: Oct 2008 Location: Wichita, Kansas Posts: 254	Re: Single Chamber Flows kills gas mileage? True/False? all I know is my mach gets on average 16-18 MPG, but I drive her everyday, 80% in town and have never ran a full tank of gas through her on highway only. __________________ 04 DSG Mach 1 5 speed+ IUP SLP Catted X Pipe SLP LM1 Catback C&L CAI 3/8ths spacer SCT 3 Custom Tune by Chris @ Wichita Dyno 318/333 NGK TR55IX's MGW Short Throw shifter Custom Headrest's by Gene Various MGW interior and underhood accents Objects in Mirror are Losing

08-10-2009, 12:34 PM	#7
Fenixfire Its stock....No really! Join Date: Jul 2005 Location: Albuquerque, NM Posts: 4,433	Re: Single Chamber Flows kills gas mileage? True/False? My Mach got 23 mpg city consistently with 4.30 gears, magnaflow magnapack catback, bassani catted x pipe, 3/8 inch intake spacer as the only mods and i was on the stock tune. I dont know what the highway mileage would have been as I never took her on a road trip. My guess would be 23-25 because of the 4.30s dont do so well on highway. __________________ 2003 Azure Blue Mach 1 5spd w/ IUP Mods: Lots of new stuff coming.....stay tuned

08-10-2009, 01:39 PM	#8
Furinox Registered User Join Date: Feb 2007 Location: DFW, TX Posts: 1,021	Re: Single Chamber Flows kills gas mileage? True/False? wouldnt make a noticeable difference. It's how you're driving or soemthing else __________________ ________________________________________ Forged Shortblock with Ported Eaton using custom mounting brackets. More information here www.never2fast.net

08-10-2009, 11:32 PM	#9
mach1metalhead Registered User Join Date: Oct 2007 Location: Orlando, FL Posts: 1,065	Re: Single Chamber Flows kills gas mileage? True/False? get tuned and report back, though it's probably just too much fun with the loud pedal __________________ 03 Mach (Auto) JLT RAI - 1/2" Intake Spacer - Mac longtubes - Mac Prochamber - Borla cat-back - PA Racing k-member - Energy Suspension motor mounts - Eibach Sportline springs - Eibach anti-roll kit - SPC caster/camber kit - Steeda X2 ball-joints - Steeda strut tower bar - Eibach 1" wheel spacers (rear only)

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