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Thread: Poor Fuel Economy

  1. #16
    Join Date
    Feb 2007
    Location
    Winston Salem, NC
    Posts
    775
    when you get that tune...lookout! the "Partay" will begin...it's a better experience in EVERY manner!
    2003 300A
    Widened Rear Wheels with 295 45 Nitto G2's
    Eaton Swapped by Curless
    Brake Upgrade
    Mo's Tune
    JLT Intake
    Addco Sway Bars
    ADTR Coil Over Suspension
    Metco Control Arms & Watts Link
    SW Headers and Exhaust
    Accessories By FastBlackMerc
    4.10 Gears
    Aeroforce Gauges
    Pantherlights Headlamps

  2. #17
    Join Date
    May 2020
    Location
    Georgia
    Age
    21
    Posts
    74
    Quote Originally Posted by Peace2Peep View Post
    when you get that tune...lookout! the "Partay" will begin...it's a better experience in EVERY manner!
    How difference is the fuel economy with the tune or is it basically negligible? I assume I'll lose out on maybe 1 or 2 MPG but it's a far cry from the 10 MPG I was getting with that godawful Reinhart tune.
    2003 300B Mercury Marauder
    Built 01/22/03
    Purchased 01/29/20
    68,xxx miles

    July 12, 2023 - 68,203 Miles - RIP original engine

    October 31, 2023 - Rebuilt engine installed

    Modifications/Stuff I have done on the car:
    Engine:
    rebuilt stock; slightly overbore. Original 68k mile heads, new OEM Ford performance timing kit, Terminator Cobra Oil Pump, Billet Steel oil pump gears, ARP head studs, main cap studs, and side bolts. The latter ARP stuff for future endeavors.
    Transmission:
    Thor 2800-3000 Stall Converter
    Suspension:
    ADTR Front + Rear Sway Bars
    Metco Billet Watts Link
    Metco Billet Rear Control Arms
    Cosmetic:
    1998-2003 Amber tail lamp conversion - Painted and smoked to near-OEM spec.
    HID Projector Headlamp Retrofit
    OEM Mercury Mountaineer Hitch Cover
    Front in-channel rain guards
    Other Stuff:
    4-pin trailer harness
    Class III Tow Hitch
    Cadillac 4-note horns
    Hayden 679 Transmission Cooler
    Obligatory Marty Tune

  3. #18
    Join Date
    Aug 2011
    Location
    Wisconsin
    Posts
    4,338
    Quote Originally Posted by baloneyhomie View Post
    How difference is the fuel economy with the tune or is it basically negligible? I assume I'll lose out on maybe 1 or 2 MPG but it's a far cry from the 10 MPG I was getting with that godawful Reinhart tune.
    It will go up from what you currently have.

    OEM with Lidio tune = 22mpg
    Add 410s = 20.5mpg (and well worth it!!)
    Add Trilogy with canned Trilogy tune at 350 RWHP = 24mpg
    Add Martyo dyno tune, 17* timing, 409 RWHP = 17mpg
    Add my custom designed exhaust fabbed by Red at Martyo's with new dyno tune, 14* timing, 436 RWHP = 20mpg (16* timing shot it to 463 RWHP so Jeff had to dial it back as still OEM block internals)

    So, ya, you can do better.

    Good luck!

    WLB
    BB#1) 1996 ImpalaSS - 16,500 miles - 100% stock
    ______________________________ ___________

    BB#2) 2003 Marauder (300a) - 34k miles - Daily Driver
    #2912 of 7093
    Conceived 8/6/2002
    Delivered 9/19/2002
    Adopted 8/10/2011
    Trilogy 242 - Self Installed 9/9/12 (0-60 5.5 sec)
    Pioneer 6x8 Front
    Legacy 600w 6x9 Rears
    JL 6.5 SubWoofer
    K&N CAI
    Window tint 50% rear/35% front
    FBM CHMSL with Strobe mod 7/1/12
    DR Deep Aluminum Trans Pan
    Sparta FOMOCO Racing 8.8 Girdle
    Mo's Dyno Tune
    Gorilla Nuts - The System
    Ford Racing 4.10s, 31 spline Cobra carrier & axles 7/1/12
    Powder Coat Axle Housing 7/1/12
    CME HP Rear Control Arms & Watts Link 7/1/12
    ______________________________ ________________

    Rex "SC Cheesehead" Weinbender 11-14-13
    Ed "Baaad GN" Linthicum 8-6-2014

  4. #19
    Join Date
    Feb 2007
    Location
    Winston Salem, NC
    Posts
    775
    Not totally sure in your specific case, but with the 4.10's and the tune you should be even or just 1-2 loss from normal. Normal for me was 21mpg
    Last edited by Peace2Peep; 10-26-2020 at 06:07 PM.
    2003 300A
    Widened Rear Wheels with 295 45 Nitto G2's
    Eaton Swapped by Curless
    Brake Upgrade
    Mo's Tune
    JLT Intake
    Addco Sway Bars
    ADTR Coil Over Suspension
    Metco Control Arms & Watts Link
    SW Headers and Exhaust
    Accessories By FastBlackMerc
    4.10 Gears
    Aeroforce Gauges
    Pantherlights Headlamps

  5. #20
    Join Date
    May 2006
    Location
    Seattle, WA
    Posts
    5,683
    Complaining about mpg with a Marauder is silly. We all know what we were getting into when we purchased this vehicle. We made our bed, we'll sleep in it.

    However... complaining about mpg with a valid reason is completely different. As GDMJOE said.. It's an anomaly.

    Even with a crappy supercharger or elite amp/sound system, No Marauder should be under 17 mpg. Are the fuel lines clear? Tank empty of debris? Saw another thread (not here on this forum and not a Marauder) that some guy got a leaf or something stuck in the tank and covered the flow from the fuel pump to the engine.

    Now, how likely is that on your Marauder? I would venture slim to none. But can't rule out the outliers. One thing I've learned with ownership of this car is that SHE'LL fool you. I hope you figure out your gremlin

    Also yes go to Marty for all things modification.
    2003 Trilogy Supercharged Marauder

  6. #21
    Join Date
    Mar 2004
    Location
    Baltimore, Md.
    Age
    64
    Posts
    11,665
    10 MPG average is horrible unless you drive WOT a majority of the time.
    If not, the exhaust fumes would be awful at idle.

    Sent from my Pixel 2 XL using Tapatalk
    2020 Ford Ranger STX DFI Turbo 2.3L 10 speed Auto
    2017 Ford Fusion Sport DFI Twin Turbo 2.7L V6 6 speed Auto (14.000 ET bone stock in 82 degree heat)
    1985 Mustang GT 5.0 Hatchback 4bbl 5 speed manual (525 HP 363 Dart block/AFR heads with Magnum 6 speed in the works)
    1984 Mustang GT 2.3 Turbo Convertible FI. 5 speed manual
    1966 427 Cobra (ERA) 468 all Aluminum FE 2x4bbl 5 speed manual

    SOLD : 2003 Mercury Marauder FI. 4 speed Auto
    w/Crower Cams & Springs, +1mm SS valves, mild port job on the cylinder heads.
    Extrude honed intake w/PHP spacer.
    Kooks Headers w/2.5" High Flow Cats & X-Pipe, Magnaflow mufflers, OEM tailpipes w/Megs Tips
    B&M Trans cooler w/fan, Level 10 Shift Kit, Art Carr Hughes Deep Sump Trans Pan,
    SVO Rearend Girdle, Redline Gear lube; OEM 3.55s
    'Real Gauges' + matching Trans Temp, Oil Temp, Water Temp, Fuel Pressure, Vacuum/Boost Gauge
    Built: 10/15/02 Bought: 12/16/02 Sold: 10/15/18

  7. #22
    Join Date
    Mar 2008
    Location
    Next door to my neighbor
    Age
    50
    Posts
    20,353
    Quote Originally Posted by Mebot View Post
    Even with a crappy supercharger or elite amp/sound system, No Marauder should be under 17 mpg.
    Step up to 80# injectors..!

    This biotch can DRINK!


    Sent from my iPhone using Tapatalk Pro
    SOLD 12/31/2021

    Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.

  8. #23
    Join Date
    May 2020
    Location
    Georgia
    Age
    21
    Posts
    74
    Hey y'all, sorry it's been so long. I totally forget about this thread, but it's been several months that I've had my Marty tune and I absolutely love it. I manage 15 mpg in my area in most of my tanks, although I still get as low as 10 sometimes, but I suspect that's just from the geography.

    All is good, and thank y'all for your suggestion of getting a Marty tune. He does good work, and my car feels so much faster.

    Thinking of maybe sticking some 4.10s in it if the fuel eco wouldn't suffer too much. Thoughts?
    2003 300B Mercury Marauder
    Built 01/22/03
    Purchased 01/29/20
    68,xxx miles

    July 12, 2023 - 68,203 Miles - RIP original engine

    October 31, 2023 - Rebuilt engine installed

    Modifications/Stuff I have done on the car:
    Engine:
    rebuilt stock; slightly overbore. Original 68k mile heads, new OEM Ford performance timing kit, Terminator Cobra Oil Pump, Billet Steel oil pump gears, ARP head studs, main cap studs, and side bolts. The latter ARP stuff for future endeavors.
    Transmission:
    Thor 2800-3000 Stall Converter
    Suspension:
    ADTR Front + Rear Sway Bars
    Metco Billet Watts Link
    Metco Billet Rear Control Arms
    Cosmetic:
    1998-2003 Amber tail lamp conversion - Painted and smoked to near-OEM spec.
    HID Projector Headlamp Retrofit
    OEM Mercury Mountaineer Hitch Cover
    Front in-channel rain guards
    Other Stuff:
    4-pin trailer harness
    Class III Tow Hitch
    Cadillac 4-note horns
    Hayden 679 Transmission Cooler
    Obligatory Marty Tune

  9. #24
    Join Date
    Jan 2004
    Location
    Somewhere in the N.C. Triangle
    Age
    68
    Posts
    26,250
    Quote Originally Posted by baloneyhomie View Post
    Hey y'all, sorry it's been so long. I totally forget about this thread, but it's been several months that I've had my Marty tune and I absolutely love it. I manage 15 mpg in my area in most of my tanks, although I still get as low as 10 sometimes, but I suspect that's just from the geography.

    All is good, and thank y'all for your suggestion of getting a Marty tune. He does good work, and my car feels so much faster.

    Thinking of maybe sticking some 4.10s in it if the fuel eco wouldn't suffer too much. Thoughts?
    You'll lose maybe 1 or 2 MPG. Well worth the 4.10's.
    “When you can’t make them see the light, make them feel the heat.”
    Ronald Regan

    "The only way to deal with the Islamic State - these blood thirsty, blood-drunken, terrorists -
    is to kill them, keep on killing them, until you kill the last one, then you kill his pet goat."

    Lt. Colonel Ralph Peters

    “Be polite, be professional, but have a plan to kill everybody you meet.”
    "I come in peace. I didn't bring artillery. But I'm pleading with you, with tears in my eyes, if you **** with me, I'll kill you all"
    General James Mattis




  10. #25
    Join Date
    May 2009
    Location
    Moreau Island
    Posts
    12,207
    If you are really getting 15 mpg's or lower in regular driving you still have a problem. Your profile says your MM is NA. I'd take the car to Mo's and have them go over it to find out why your mpg's are so bad. You should be getting low to mid 20mpg's.

  11. #26
    Join Date
    May 2020
    Location
    Georgia
    Age
    21
    Posts
    74
    Quote Originally Posted by Mr. Man View Post
    If you are really getting 15 mpg's or lower in regular driving you still have a problem. Your profile says your MM is NA. I'd take the car to Mo's and have them go over it to find out why your mpg's are so bad. You should be getting low to mid 20mpg's.
    It's effectively stock. I assumed 15 was normal for NA but I guess not. My old '09 SAP CVPI with 3.27s managed a solid 20-25 in my town.

    Luckily I live about an hour away from Mo's; I assume I just gotta give his shop the call and let him know what's up?

    Now I'm getting a bit worried, considering how good of shape this particular car is in
    2003 300B Mercury Marauder
    Built 01/22/03
    Purchased 01/29/20
    68,xxx miles

    July 12, 2023 - 68,203 Miles - RIP original engine

    October 31, 2023 - Rebuilt engine installed

    Modifications/Stuff I have done on the car:
    Engine:
    rebuilt stock; slightly overbore. Original 68k mile heads, new OEM Ford performance timing kit, Terminator Cobra Oil Pump, Billet Steel oil pump gears, ARP head studs, main cap studs, and side bolts. The latter ARP stuff for future endeavors.
    Transmission:
    Thor 2800-3000 Stall Converter
    Suspension:
    ADTR Front + Rear Sway Bars
    Metco Billet Watts Link
    Metco Billet Rear Control Arms
    Cosmetic:
    1998-2003 Amber tail lamp conversion - Painted and smoked to near-OEM spec.
    HID Projector Headlamp Retrofit
    OEM Mercury Mountaineer Hitch Cover
    Front in-channel rain guards
    Other Stuff:
    4-pin trailer harness
    Class III Tow Hitch
    Cadillac 4-note horns
    Hayden 679 Transmission Cooler
    Obligatory Marty Tune

  12. #27
    Join Date
    May 2020
    Location
    Georgia
    Age
    21
    Posts
    74
    Quote Originally Posted by fastblackmerc View Post
    You'll lose maybe 1 or 2 MPG. Well worth the 4.10's.
    I'll put them on the list, in that case.
    2003 300B Mercury Marauder
    Built 01/22/03
    Purchased 01/29/20
    68,xxx miles

    July 12, 2023 - 68,203 Miles - RIP original engine

    October 31, 2023 - Rebuilt engine installed

    Modifications/Stuff I have done on the car:
    Engine:
    rebuilt stock; slightly overbore. Original 68k mile heads, new OEM Ford performance timing kit, Terminator Cobra Oil Pump, Billet Steel oil pump gears, ARP head studs, main cap studs, and side bolts. The latter ARP stuff for future endeavors.
    Transmission:
    Thor 2800-3000 Stall Converter
    Suspension:
    ADTR Front + Rear Sway Bars
    Metco Billet Watts Link
    Metco Billet Rear Control Arms
    Cosmetic:
    1998-2003 Amber tail lamp conversion - Painted and smoked to near-OEM spec.
    HID Projector Headlamp Retrofit
    OEM Mercury Mountaineer Hitch Cover
    Front in-channel rain guards
    Other Stuff:
    4-pin trailer harness
    Class III Tow Hitch
    Cadillac 4-note horns
    Hayden 679 Transmission Cooler
    Obligatory Marty Tune

  13. #28
    Join Date
    Jun 2008
    Location
    Waukesha, WI
    Posts
    1,604
    My first Marauder was stock when I bought it. My first mod was 4.10's and a tune. Best bang for the buck!
    You "feel" the difference because you want to "feel" the difference. Since you just spent money on the upgrade you "have" to feel the difference

    I'm looking to eliminate the double pump process I have to follow right now to get the pedal hard

    2004 300A Procharger #0010 D1X
    2003 300A Procharger #0017 D1SC (SOLD. Last I heard, it was in Washington State)

  14. #29
    Join Date
    Jun 2011
    Location
    Northeast OH
    Posts
    7,999
    How are you calculating fuel mileage? Are your rear tires factory size?
    2004 SB Ported Trilogy 48
    Has supporting mods and stuff
    Thanks to Marty O for his help in updating this car.

    R.I.P.
    Rex "SC Cheesehead"

  15. #30
    Join Date
    May 2020
    Location
    Georgia
    Age
    21
    Posts
    74
    Quote Originally Posted by RubberCtyRauder View Post
    How are you calculating fuel mileage? Are your rear tires factory size?
    Dividing the miles driven on the trip odometer (reset it every tank) by the gas pumped into the car next time I fill up. I got 12ish MPG on my last tank. Tires are factory size.
    2003 300B Mercury Marauder
    Built 01/22/03
    Purchased 01/29/20
    68,xxx miles

    July 12, 2023 - 68,203 Miles - RIP original engine

    October 31, 2023 - Rebuilt engine installed

    Modifications/Stuff I have done on the car:
    Engine:
    rebuilt stock; slightly overbore. Original 68k mile heads, new OEM Ford performance timing kit, Terminator Cobra Oil Pump, Billet Steel oil pump gears, ARP head studs, main cap studs, and side bolts. The latter ARP stuff for future endeavors.
    Transmission:
    Thor 2800-3000 Stall Converter
    Suspension:
    ADTR Front + Rear Sway Bars
    Metco Billet Watts Link
    Metco Billet Rear Control Arms
    Cosmetic:
    1998-2003 Amber tail lamp conversion - Painted and smoked to near-OEM spec.
    HID Projector Headlamp Retrofit
    OEM Mercury Mountaineer Hitch Cover
    Front in-channel rain guards
    Other Stuff:
    4-pin trailer harness
    Class III Tow Hitch
    Cadillac 4-note horns
    Hayden 679 Transmission Cooler
    Obligatory Marty Tune

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