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07-30-2020, 02:01 PM
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#21
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Senior Member
Join Date: Aug 2015
Location: Golden, CO
Posts: 952
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Quote:
Originally Posted by nortryder
I'm curious, why would bad converters affect mileage?
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Because the O2 sensor talks to the ECU about how the engine is running. The ECU adjusts the air/fuel ratio to compensate. At least that is my understanding in laymen's terms.
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07-30-2020, 02:21 PM
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#22
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Junior Member
Join Date: Feb 2017
Location: Arkansas
Posts: 23
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I have a 2005 GMC extended body 4x4 high roof gas eater but if I stay mostly out of cities I typically get about 13.5. Single digits inside city.
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07-30-2020, 09:17 PM
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#23
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Senior Member
Join Date: Feb 2010
Location: Burbank
Posts: 282
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2003 E350, 7.3 SMB, 275,000
Completely stock engine and exhaust.
A constant 15 mpg last tank was 15.8
Max speed 70 cruise speed usually 65 (retired and don't have to be anywhere tomorrow)
Occasionally will add DIESEL KLEEN +Cetane additive.
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07-31-2020, 05:36 AM
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#24
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Senior Member
Join Date: Dec 2015
Posts: 144
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2016 Promaster 3.0l Diesel conversion done by SMB Texas. 23MPG.
I don't understand the fascination with 5 and 6 liter engines - unless you are towing, why do you need that much power, ESPECIALLY if you are offroading since all that does is spin the wheels into the ground.
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07-31-2020, 06:24 AM
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#25
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Senior Member
Join Date: Mar 2015
Location: Maryland
Posts: 3,348
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2006 6.0 that achieves a constant 12.9 - 13.3. Motor is pulling a 11,500lb extended Van, with 35’s and 4:56 gears - run 2300rpm at 70mph. usually run 65mph since we do a lot of the long-haul freeway traveling between 9pm and 7am - keeps my fist from pounding dents on the dash since there’s a lot less idiots on the road.
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TwoXentrix
"AWOL"
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07-31-2020, 07:09 AM
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#26
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Site Team
Join Date: Jan 2010
Location: Las Vegas, Nevada
Posts: 1,537
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10 - 12 MPG for us. The best mileage we got was with a strong tailwind -- 12.7.
__________________
Mac McIntire
2003 Ford E250, 5.4L V8,
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07-31-2020, 08:07 AM
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#27
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Senior Member
Join Date: Jan 2011
Location: Reynoldsburg, Ohio
Posts: 3,765
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Quote:
Originally Posted by simplesez
Because the O2 sensor talks to the ECU about how the engine is running. The ECU adjusts the air/fuel ratio to compensate. At least that is my understanding in laymen's terms.
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Yep and a bad converter might also cause an exhaust restriction or blockage which also negatively affects the air/fuel ratio.
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07-31-2020, 09:39 AM
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#28
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Junior Member
Join Date: Mar 2018
Location: Livingston, MT
Posts: 22
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2003 7.3l with 6" UJOR lift, 4:11's, 35" tires, AdVanture interior (need to get it weighed), SMB top, and 4" turbo back exhaust:
80 mph...who cares, you are driving a 6" lifted van...fuel economy is the least of your concerns
70 mph generally consumes 10-12 mpg,
55 mph delivers 13-15 mpg.
I live in MT so you are always going over some mountain pass.
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2003 E350, 7.3L, Sportsmobile Top, Advanture Interior, U-Joint 4WD/coil conversion and 2005 front clip
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07-31-2020, 11:13 AM
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#29
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Senior Member
Join Date: Jan 2015
Location: Lomita, CA
Posts: 851
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2002 E350 V10/4R100 passenger
~7500lbs loaded, 6" lift, 35" tires, 4.56 gears, tuner, exhaust, no main cat
I don't speed (unless offroad)
9mpg city
10mpg highway (2500 rpm @ 70)
8mpg offroad
Numbers have been tracked for the 5 years I've owned it and never change
Scott Thompson
Vantage Optics
__________________
2002 Ford E350 V10 Traveler
Vantage Optics Headlights
www.VantageOptics.com
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08-03-2020, 05:35 PM
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#30
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Senior Member
Join Date: Aug 2009
Posts: 161
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2001 E350 EB 6" Lift, 305x75x16" tires, 4x4, V10, Pop top
10mpg all the time.
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