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Old June 29th, 2011, 07:13 PM   #1
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Default Tow Rig Fuel Economy Database

I often see people ask what mileage they can etxpect from a certain truck. I propose we start a database with standardized categories to help record what rig does what / when / where / how.

I'll start:

Truck:
1996 F250 ECLB
Drive:
2WD
Engine:
7.3L PSD
Trans:
manual
Axle ratio:
3.55:1
Tires:
235/85R16
Mods:
Tymar intake, tapeworm and cat delete, twildman 6 pos chip

Best Fuel Economy Empty (6600 lb):
21 mpg

Best Fuel Economy Loaded (12,500 lb combined):
16.4 mpg averaged over 7000 mile trip

Load / Driving:
Pop-up truck camper, 6x12 enclosed trailer / cruise control set on 65.

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Last edited by ScOoTeR; June 29th, 2011 at 09:46 PM.
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Old June 29th, 2011, 07:23 PM   #2
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Speed is the single most important factor in towing mileage. It would be pretty stupid to do this without listing speeds too.

Truck:
2006 2500HD
Drive:
4x4
Engine:
Duramax LBZ
Trans:
Allison 6 speed auto
Axle ratio:
3.73
Tires:
275/75R16, LRE
Mileage / Performance Mods:
4" MBRP Exhaust, kitty ran away
AFE intake
EFI live tunes - 100 HP sport / economy, 50 HP tow


Best Fuel Economy Empty (7200 lb):
26 at 55 MPH
23 at 70 MPH
19 at 80 MPH

Fuel Economy Loaded:
17,000# loaded, open deck, tall truck
average 13-14 MPG at 65 MPH
average 10-12 MPG at 75-80 MPH

17,000# loaded, 8.5x24 enclosed trailer, 12" extra height
11.5 - 12.5 at 65 MPH
10.0 - 11.5 at 75 MPH






Last edited by knaffie; June 29th, 2011 at 10:02 PM.
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Old June 29th, 2011, 07:49 PM   #3
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Truck:
2001 AM General HMCS
Drive:
AWD
Engine:
6.5 liter G.E.P. turbo diesel with Heath controller, 3.5" free flow exhaust
Trans:
4L80E
Axle ratio:
2:56 diff, 1.92 geared hub
Tires:
37x12.50Rx17

Best Highway Fuel Economy Empty (7602 lb):
17 mpg

Best Highway Fuel Economy Loaded (13,800 lb):
14.5 mpg

Load / Driving:
Loaded to the roof with people, camping gear & tools towing a Jeep on a 20' steel deck open trailer / cruise control set on 55.
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Old June 29th, 2011, 08:36 PM   #4
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Quote:
Originally Posted by ScOoTeR View Post
Best Fuel Economy Empty (6600 lb):
21 mpg

Best Fuel Economy Loaded (12,500 lb):
16.4 mpg averaged over 7000 mile trip
Just to clarify for others, this should be a combined truck and trailer weight, not just trailer weight, correct?
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Old June 29th, 2011, 09:04 PM   #5
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Truck:
2011 F-150 Fx4 CC SB
Drive:
4WD
Engine:
Ecoboost 3.5 V6
Trans:
6 speed auto
Axle ratio:
4.10:1
Tires:
33x12.5r20 Toyo MT's


Best Fuel Economy Empty (6000 lb):
19mpg 60-65mph unloaded highway, averages 15 city. (My tires and gears aren't ideal for fuel economy)

Best Fuel Economy Loaded (12,000 lb...6k truck, 6k trailer (at least))
8.5mpg, average over multiple 500+ mile round trips from home to the dunes and back

Load / Driving:
truck loaded with gear and 2 people, 24x8.5 enclosed trailer/ cruise control set on 65.




While drafting a semi, I was averaging 12.7 mpg...but that is cheating (which I try to do as often as possible). Yes, I know I should have bought a new diesel instead...2.5 more years and I will.

Last edited by 04PSD; June 30th, 2011 at 07:28 AM.
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Old June 29th, 2011, 09:41 PM   #6
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Quote:
Originally Posted by knaffie View Post
Speed is the single most important factor in towing mileage. It would be pretty stupid to do this without listing speeds too.
Quote:
Originally Posted by ScOoTeR View Post
Load / Driving:
Pop-up truck camper, 6x12 enclosed trailer / cruise control set on 65.

Way ahead of you, Chief.
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Old June 29th, 2011, 09:42 PM   #7
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Quote:
Originally Posted by Bones View Post
Just to clarify for others, this should be a combined truck and trailer weight, not just trailer weight, correct?
Yes, thanks! :)
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Old June 29th, 2011, 10:13 PM   #8
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Truck:
1995 Dodge Cummins
Drive:
4x4
Engine:
12 vlave cummins
Trans:
47rh auto
Axle ratio:
3.55
Tires:
285/70/17 lrd
Mileage / Performance Mods:
4" turbo back strait pipe
No fuel plate, 3k gov springs
BHAF
Craftsman stacked with a snap on tunes


Empty truck at 8200lbs i believe 14-15 around town
best of 24 mpg on high way 70 mph
18 mpg towing jeep on flat bed on high way. 70 mph
15 towing jeep on flat bed cross country stop and go bs
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Old June 29th, 2011, 10:26 PM   #9
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Truck:
2009 F150 Supercrew
Drive:
4WD
Engine:
5.4 triton V8
Trans:
6 speed auto
Axle ratio:
3.55:1
Tires:
265/70R17
Mods:
none

Best Fuel Economy Empty (6000 lb): (really, these are typicals/bests)
20 mpg (55mph highway following my deuce)
18mpg (70mph highway)
14mpg city with lots of stop and go.

Best Fuel Economy Loaded (12,000 lb combined):
12 mpg averaged over 700 mile trip

Load / Driving:
Scrambler on 37s, 16ft tandem car hauler (wood deck flatbed)

Works for what I want/need.
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Old June 29th, 2011, 11:15 PM   #10
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2000 ford f350 4x4 7.3 liter, 4.5" downpipe, 5" tail pipe

tires 305/70 r16's

21-22 @ 64 mph
17-18 at 70 mph

10 mpg towing anything.


Last edited by kickstand; July 8th, 2011 at 11:57 AM.
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Old June 30th, 2011, 12:23 PM   #11
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2008 Dodge Ram Hemi(mds), 4-door, 4x4, 20" wheels, 3.92 gears

Empty

20+ @ <65mph highway
16-18@ >70mph highway
14 city

Towing

12-13 @ <65 with small camper/enclosed trailer/vehicle on flatbed trailer
<10 @ >70 with same

6 @ >80mph with 20ft enclosed v-nose + 13 mx bikes & gear (mi to Vegas northern route)
10 @ >80 same -2bikes southern route through dust storms, fires, crazy cross winds, and severe thunderstorms.
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Old June 30th, 2011, 12:31 PM   #12
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Truck:
1996 F250 SD 4x4
Drive:
4WD
Engine:
7.3L - chipped- DP Tuner
Trans:
auto
Axle ratio:
3.73:1
Tires:
285/75R16
Mods:
muffler delete, DP 5 pos chip

Best Fuel Economy Empty (8800 lb):
21 mpg

Best Fuel Economy Loaded (15,500 lb combined):
13.8 mpg

Load / Driving:
ZJ on trailer with tons of extra parts, tools, gear cruise control set on 65.
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Old June 30th, 2011, 01:00 PM   #13
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Truck:
2011 GMC Sierra 1/2 ton 4x4
Drive:
4WD
Engine:
6.2 V-8 Gas
Trans:
6 spd auto
Axle Ratio:
3.73
Tires:
Sorry, don't know but stock factory
Mods:
None

Best Fuel Economy Empty:
15 City
15-17 Hwy (always pushing the limit from at to + 7)

Best Fuel Economy Loaded: (guessing around 13.000# combined)
8-9 Hwy (68-72 mph)

Load / Driving
YJ on 18 ft flatbed estimated @ 7,000#
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Old June 30th, 2011, 01:04 PM   #14
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2000 k3500 GMC SCLB SRW with 350 and 4l80 trans, 4.10 gears, 255-85 r16 Cooper ST's. EGR and cat delete have not changed fuel economy, also has not been significantly retuned - near future modification.

Best fuel economy not towing- 14.7mpg.
Once coming out of the mountains of Colorado with the cruise ~85mph+, AC on, motorcycle + test equipment, two guys, est 8,000lbs. Several times unloaded (~6100lbs) back and forth to work, keeping speed ~67mph plus stop signs on the back roads, never over 2200rpm, always on summer fuel.
13.5-14 when running 72-75. 13-13.5 when running 85-90 with cruise on.
12.5ish commuting to work with winter fuel.

Best economy towing -12.5 mpg.
Towing a pickup with combined weight of ~12k. Significant excursions with foot to the floor, never broke 60 as all two-lane highway driving.

Worst economy towing - 11.0mpg. Towing Unimog with the aerodynamics of a house at 14klbs+ combined and my right foot on the loud pedal in the radiator. 65-70mph.
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Old June 30th, 2011, 01:20 PM   #15
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Truck:
2005 Ram 3500
Drive:
2WD
Engine:
5.9 Cummins
Trans:
Nv5600 6 spd manual
Axle Ratio:
3.73
Tires:
265’s on 17’s
Mods:
None

Best Fuel Economy Empty: (7200#)
21-22 mpg if kept under 75mph

Best Fuel Economy Loaded: (14500# comb. w/ jeep&trailer)
11 mpg (75 mph)
14 mpg (65 mph)

Best Fuel Economy Loaded: (16500# comb. w/ travel trailer)
11.5 mpg (65 mph)
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Old June 30th, 2011, 01:33 PM   #16
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Truck:2008 Dodge Ram Hemi 4-door with factory trailer package

Engine: 5.7L "Hemi" with MDS

Drive:
4WD

Trans:
Auto 5-speed with tow/haul & OD lockout modes

Axle ratio:
3.92

Best economy Empty: (~6000 lbs):
22 through NC and VA with observed/enforced 65 mph speed limits and moderate temps (limited AC). No trailer/light load. MDS utilized.

Typical economy empty (~6000 lbs):
18-22 @ <65mph highway
16-18@ >70mph highway
14-16 city/mixed

Best Economy Towing (~10,500 - 16' tandem axle v-nose trailer with 7' width and 6' interior height hauling three ATVs) :

10-13 @ 65-70 using "tow/haul" mode - no MDS
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Old June 30th, 2011, 01:44 PM   #17
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Quote:
Originally Posted by Klumpper View Post
2000 k3500 GMC SCLB SRW with 350 and 4l80 trans, 4.10 gears, 255-85 r16 Cooper ST's. EGR and cat delete have not changed fuel economy, also has not been significantly retuned - near future modification.
EGR aids fuel economy.
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Old June 30th, 2011, 02:21 PM   #18
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Quote:
Originally Posted by ScOoTeR View Post
EGR aids fuel economy.
Yes, in an ideal world were the throttle angles and engine loads are low, ignition is at an advanced enough to take advantage of it, and engine speed is low enough to not suck lots of air. 4.10's and a 4l80 trans on the highway don't allow it.

I didn't purposely disable the EGR... Doing the intake gasket job the L31's need frequently crushed the EGR hose, and michigan salt + plow truck duty cycle doesn't allow for removing the hose from the manifolds.... fml. Consequently, the mileage did not drop from the blown intake gasket state + egr to the good intake gasket state -egr.

michigan salt-> <- me

When the 8.1 goes in I fully intend on doing experiments with and without EGR and EFILive. But i need to come up with 2k and 200 hours of free time.
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Old June 30th, 2011, 02:36 PM   #19
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Quote:
Originally Posted by ScOoTeR View Post
EGR aids fuel economy.
In the black community, we don't talk about "aids".
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Old June 30th, 2011, 03:00 PM   #20
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Damn man with some mods and a chip/tune your truck has the potential of some high mpg and hp numbers. I love 3500 6 speeds and the 2wd really helps the mpg's.

Quote:
Originally Posted by Eric99tj View Post
Truck:
2005 Ram 3500
Drive:
2WD
Engine:
5.9 Cummins
Trans:
Nv5600 6 spd manual
Axle Ratio:
3.73
Tires:
265ís on 17ís
Mods:
None

Best Fuel Economy Empty: (7200#)
21-22 mpg if kept under 75mph

Best Fuel Economy Loaded: (14500# comb. w/ jeep&trailer)
11 mpg (75 mph)
14 mpg (65 mph)

Best Fuel Economy Loaded: (16500# comb. w/ travel trailer)
11.5 mpg (65 mph)
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