Page 3 of 3 FirstFirst 123
Results 31 to 39 of 39

Thread: Poor Fuel Economy

  1. #31
    Join Date
    May 2009
    Location
    Moreau Island
    Posts
    12,207
    Quote Originally Posted by baloneyhomie View Post
    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
    Make the call to Mo's. I'm getting 24-5mpg on the freeway and 19-21mpg putting around town. Be interested to hear why your mileage is so bad. I'm making an assumption you are not wide open everywhere you go.

  2. #32
    Join Date
    May 2020
    Location
    Georgia
    Age
    21
    Posts
    74

    Poor Fuel Economy

    Quote Originally Posted by Mr. Man View Post
    Make the call to Mo's. I'm getting 24-5mpg on the freeway and 19-21mpg putting around town. Be interested to hear why your mileage is so bad. I'm making an assumption you are not wide open everywhere you go.
    Nope. I went a full tank going full grandpa-light-on-the-pedal once or twice and still only managed 15. I drive it mildly spirited and I still (sometimes) get as low as 10. Usually 12-15 though.

    Who would have thought this thing managed the same fuel economy of my three ton hightop Chevy conversion van with the 350.

    No worries though, I’ll shoot Marty a call once I’m free this afternoon.
    Last edited by baloneyhomie; 02-19-2021 at 12:34 PM.
    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. #33
    Join Date
    Oct 2004
    Location
    Cape Cod, MA
    Age
    67
    Posts
    2,601
    No way should you be getting such poor gas mileage. I would be very curious to hear what Marty finds. I am guessing if you are calculating your mileage correctly I would check: brakes possible bad calipers. Pull all spark plugs they will give you a world of info. Maybe your injectors are leaking, bad or wrong stall speed converter or maybe cams have been advanced either way your car will be in the best of hands.
    2004 marauder black purchased new. Sold 9/16 at 297,000 miles. Still ran strong didn't burn a drop of oil.
    2003 marauder black 28,000 miles all stock. Garage Queen.
    2004 marauder red daily driver.

  4. #34
    Join Date
    May 2020
    Location
    Georgia
    Age
    21
    Posts
    74
    Quote Originally Posted by burt ragio View Post
    No way should you be getting such poor gas mileage. I would be very curious to hear what Marty finds. I am guessing if you are calculating your mileage correctly I would check: brakes possible bad calipers. Pull all spark plugs they will give you a world of info. Maybe your injectors are leaking, bad or wrong stall speed converter or maybe cams have been advanced either way your car will be in the best of hands.
    Just checked the plugs in fact. They look good, ditto for the coils. I have yet to service the brakes or calipers since my purchase of it last year although it doesn’t feel like anything is wrong on the brake side of things.

    I gave him a call and left a voice message and let him know what’s up. Will update y’all accordingly.
    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

  5. #35
    Join Date
    Mar 2008
    Location
    Next door to my neighbor
    Age
    50
    Posts
    20,353
    Probably just some lazy oxygen sensors.

    But don’t believe every claim you here. When mine was first purchased the best I could get was 21.5. This was zero traffic, speed limit 45 for five miles, then expressway for fifteen, and finally another fifteen or so of country roads at 55 with maybe four stop signs so definitely not city but a mixture nonetheless.

    Then I put on the Trilogy I used to have and mileage actually went up one from tuning I suppose.

    Finally a best ever of 23.5 once I had a dyno session and custom tune.

    It’s been a long road down to single digits since.


    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.

  6. #36
    Join Date
    May 2020
    Location
    Georgia
    Age
    21
    Posts
    74
    It's entirely possible you are right - I'm also a stubborn fella and I would really like to think I could squeeze more MPGs out of this 2 ton hunk of steel.


    At worst, I'll be tuning up the crap outta this car, so maybe not a complete fool's errand.
    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

  7. #37
    Join Date
    May 2020
    Location
    Georgia
    Age
    21
    Posts
    74
    I spoke to Marty a week ago and he suggested some stuff. I've already done the first two suggestions, and the third was swap the fuel filter. (The filter on my car is 5 years old)

    The filter only has 5kish miles on it, but it's an 8 dollar part from Rockauto and OEM so worth a shot. I hope to replace it and maybe even crack open the old one and see how it looks. Will update more, thanks y'all.
    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

  8. #38
    Join Date
    Jun 2012
    Location
    Grand Rapids
    Posts
    3,833
    Quote Originally Posted by baloneyhomie View Post
    About an hour drive from where I live. I'll try and put some time aside to give them a visit this weekend. That being said, what's the issue with the Reinhart tune, or is it more of the fact that Mo's Speed Shop is just better?
    Be sure to call first, don't just show up. Busy as hell shop, it's based on appointments not walk ins... it's not Autozone...
    #2941 300A
    4.10's, carbon clutches
    Marty O Tune
    Curless Cure
    Widened Wheels
    Dead Pedal
    Eaton Swapped

    Bar tender and maker of:
    Christmas in a cup
    The "Bucket of South Haven Iced Tea"
    One Legged Lesbian Kickboxer
    Cocka Two

  9. #39
    Join Date
    May 2020
    Location
    Georgia
    Age
    21
    Posts
    74
    Yes I had figured after I sent my message that it's probably not a wise idea to show up without an appointment

    No worries though
    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

Page 3 of 3 FirstFirst 123

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. different fuel makin huge fuel economy difference?
    By montyd in forum Community Discussion
    Replies: 16
    Last Post: 08-31-2012, 07:24 PM
  2. exceptions for fuel economy
    By Bradley G in forum The Lounge
    Replies: 5
    Last Post: 07-01-2011, 09:07 PM
  3. Fuel Economy
    By Aren Jay in forum Community Discussion
    Replies: 11
    Last Post: 09-04-2007, 07:42 PM
  4. Pro Guard increases fuel economy
    By Mike Poore in forum Community Discussion
    Replies: 10
    Last Post: 10-21-2005, 06:12 AM
  5. Mods for better fuel economy!
    By FordNut in forum Community Discussion
    Replies: 6
    Last Post: 02-26-2004, 04:52 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •