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
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.
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
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.
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
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
#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
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
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