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Old June 30th, 2011, 02:02 PM   #21
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Quote:
Originally Posted by Klumpper View Post
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.
LOL, good man.
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Old June 30th, 2011, 02:52 PM   #22
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I want to play, but if I actually calculate out how shitty the mileage is I may kill myself...lol
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Old June 30th, 2011, 03:15 PM   #23
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Truck:
2006 GMC 2500HD ECSB
Drive:
4WD
Engine:
6.0 gas
Trans:
4L80E
Axle ratio:
4.10:1
Tires:
285/75/R16 Toyo Open Country AT Load D
Mods:
K&N "FIPK II" Load Lifter 5000 air bags

Best Fuel Economy Empty (5500lbs):
15mpg hwy
Best Fuel Economy Loaded (10,500-11,000lbs my best guess):
8.7 around 100 miles each way

Load / Driving:
18' steel deck open car hauler with my s10 truggy on the back and quad
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Old July 2nd, 2011, 03:01 PM   #24
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Truck:
2006 Toyota Tundra Reg Cab
Drive:
1WD
Engine:
4.7L VVTi
Trans:
5 spd auto
Axle ratio:
3.92:1
Tires:
265/70/16
Mods:
Pinstripe and some StickerZ

Best Fuel Economy Empty (4100 lb):
23 mpg avg is usually upper teens

Best Fuel Economy Loaded (~8500 lb combined):
14 mpg flat ground, mountains suck so it's not uncommon for it too guzzle petrol.

Load / Driving:
Samurai on 16' trailer + tools no cruise so i usually go 60-75 depending on southerns and my attention span.
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Old July 3rd, 2011, 11:18 AM   #25
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Quote:
While drafting a semi, (which I try to do as often as possible).
It's not drafting, it's tailgating, which is unsafe and illegal.
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Old July 3rd, 2011, 11:56 AM   #26
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Truck:
1994 Ford F350 dually
Drive:
2WD
Engine:
7.3L turbo IDI
Trans:
auto
Axle ratio:
4.10:1
Tires:
215/80 16
Mods:
No muffler, injection pump turned up

Best Fuel Economy Empty (7100lb):
15

Best Fuel Economy Loaded (15,500 lb combined):
12.5 (summer) 10 (winter)

Load / Driving:
3000# 1985 Audi 4WD rallycross car on top of a 6500# equipment traler

Note: Truck has 302k on the clock and has been shown no love by previous owners.
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Old July 4th, 2011, 07:14 AM   #27
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Quote:
Originally Posted by mschaffer66 View Post
I want to play, but if I actually calculate out how shitty the mileage is I may kill myself...lol
Lol.

Brings up a good point, of the claimed mpg numbers which are hand calculated (and has the speedo/odometer has been verified for accuracy with a gps or by some other means) and which mpg numbers are taken from the manufacturer's lie-o-meters?
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Old July 4th, 2011, 08:34 AM   #28
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Depends on manufacturer - I know GM's FE calc is within 2% if the stock tire size is used.
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Old July 4th, 2011, 11:37 AM   #29
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I don't know about Ford's FE calcualtor, but regarding the speedometer, Ford spec is 0%-4% UNDER at 60 mph. IE if your speedo says 60, you are going 56-60 mph. We will not put your actual speed over your indicated speed.
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Old July 4th, 2011, 01:32 PM   #30
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When I hand-calced FE, my factory lie-o-meter has been pretty accurate (i.e. tighter than +/- 5%).
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Old July 4th, 2011, 02:03 PM   #31
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my dads truck lol:
2004 3500 ram cummins
Drive:
4wd
Engine:
6 cly 24 valve
Trans:
auto
Axle ratio:
stock
tires:
stock
Mods:
stock

Best Fuel Economy Empty:
21 mpg

Best Fuel Economy Loaded (truck plus 13,500 fifth wheel and 1,300 boat behind that):
11-13 mpg

Load / Driving:
35 ft fifth wheel and a 17 ft boat, cruise is normally on 68.
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Old July 4th, 2011, 02:23 PM   #32
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Since I bought tons f250/f350s so I doing list trucks that was good.

truck :
1987 f250 reg
Drive:
2wd
Engine:
6.9L V8 diesel IDI NONTURBO
Trans:
T18 4 speed
Mile:
Unknown could be 157 or 257 or 357K miles
Axle ratio:
3.55
stock tires:
235/85/16

Best Fuel Economy Empty:
23 mpg but it alway load with tools. 1000 pound Speed were 60 mph

Best Fuel Economy Loaded (truck plus dump trailer/ 5k pound concrete) Estimated 13,500 pound
Load / Driving: 13 mpg

Truck:
1999 F250 reg
Drive:
2wd
Engine:
5.4L V8
Trans:
auto 4R100 it slipping
Miles:
246,000
Axle ratio:
3.73
tires:
235/85/16

Empty it about 5400 pound. Best mileage down highway 60 mph. 17 mpg.

On speed limiter it got 16 mpg with 1200 pound of brick in bed.

Best Fuel Economy Loaded (truck plus trailer/ 9,700 lb F350 dually box) 16,700 pound at scrap weight scale. It got 5 mpg rpm were 3500 most time.
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Old July 5th, 2011, 09:59 AM   #33
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Quote:
Originally Posted by Kane View Post
It's not drafting, it's tailgating, which is unsafe and illegal.
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Old July 7th, 2011, 09:59 AM   #34
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Truck:
2001 Ford SD F350

Drive: 4x4
Engine: 6.8L v10, 3" Flowmaster cat-back exhaust
Trans: 4-speed auto
Axle ratio: 4:30
Tires: 38x15.50Rx17

Highway Fuel Economy Empty (7200 lb):
12 mpg @ 56 mph
10 mpg @ 72 mph
9 mpg @ 76 mph

Highway Fuel Economy Loaded (truck/trailer/jeep 13,800 lb):
8 mpg @ 62 mph
6 mpg @ 72 mph


-------------------------------

SUV:
2011 Jeep Wrangler Unlimited

Drive: 4x4
Engine: 3.8L v6 minivan, 2.5" Flowmaster cat-back exhaust
Trans: 4-speed auto
Axle ratio: 4:10
Tires: 37x12.50Rx17

Highway Fuel Economy Empty (5500 lb):
18 mpg @ 56 mph
15 mpg @ 72 mph
12 mpg @ 76 mph

Highway Fuel Economy Loaded (jeep/trailer/RZR 7,800 lb):
13 mpg @ 62 mph
11 mpg @ 72 mph
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Old July 7th, 2011, 10:14 AM   #35
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Just did 1,000 miles this weekend, went to snowshoe, west virginia. 75 mph in michigan, 60-65 in ohio, some stop and go, 65 or 70 mph in west virginia, some 55, and back. Mountains ate up some fuel mileage, but for the entire trip I averaged 17 mpg. 18 hours total trip time.

56 mph average, including fuel and food stops. Probably closer to a 65 mph overall driving average.
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Old July 7th, 2011, 07:51 PM   #36
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Truck: 1997 f-350 crew cab long box

engine: 7.3 powerstroke

drive: 4wd

trans: auto

mileage: 168,000

tires: 315-75-r17 bfg all terrains

mods: stock downtube no cat 4 inch to 6 inch dual stacks

k&n cold air intake

superchips tuners always on tow safe mode

Best fuel economy empty 7800 lbs: 17.5 mpg @65

Best fuel economy loaded 13,800: 13.5 mpg @ 65

looking at everyone elses numbers i feel i should be getting alittle better empty? maybe the big tires?
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Old July 7th, 2011, 07:58 PM   #37
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Quote:
Originally Posted by mudrunner456 View Post

looking at everyone elses numbers i feel i should be getting alittle better empty? maybe the big tires?
The stock downpipe is pretty restrictive, and those tires are pretty big to turn.
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Old July 8th, 2011, 08:51 AM   #38
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Originally Posted by ScOoTeR View Post
The stock downpipe is pretty restrictive, and those tires are pretty big to turn.

Yea i need tires soon so i was thinking about downsizing a bit.
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Old July 8th, 2011, 09:24 AM   #39
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Truck: 2001 Ford Excursion

engine: 7.3 powerstroke

drive: 4wd 3.73

trans: auto

mileage: 216,000

tires: 265/65/18 bfg all terrains

mods: 4" turbo back

intake

edge programmer

Best fuel economy empty 7800 lbs: 21mpg @68

Best fuel economy loaded 14,700: 15 mpg @68

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Old July 9th, 2011, 01:13 AM   #40
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Quote:
Originally Posted by mschaffer66 View Post
I want to play, but if I actually calculate out how shitty the mileage is I may kill myself...lol
X2

But roughly I was getting 13.5 empty with stock 265/70/17's, 12.5 with a leveling kit and 285/70/17 duratracs (empty) 7.5 with my four-spot enclosed with 4 sleds in it, 11 empty after the 7" lift and 325/65/18 toyos.

The truck is a 2010 2500hd crew cab, 3.73's 6 speed auto, 4x4, 6.0 vortec.
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