Workhorse? Chassis 8.1L Vortec Engine - mileage

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sebentinc

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Jan 6, 2019
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Can anyone give an estimate on the potential mileage (Workhorse? Chassis 8.1L Vortec Engine; 44,000miles) with a fresh tune-up?
 

PJ Stough

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Sep 20, 2009
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Central Iowa
We have the 8.1 in a W-24 chassis with a 39 foot motorhome and we get an honest six miles to the gallon which includes generator time.
 

Isaac-1

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Dec 3, 2016
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5,858
Location
SW Louisiana
A lot depends on the size of the coach, are we talking a 26 ft long 15,000 GVWR chassis or a 38 ft long 24,000 GVWR chassis, also does it have the 4 speed transmission as use don the P series chassis with 8.1L Vortec, or the 5, or in later years 6 speeds used on the W series chassis?  Then comes where and how are you driving, driving at 55 mph on mostly flat land I get a bit over 9 mpg on my 17,000  GVWR 28 ft coach on P32 chassis with 4 speed transmission, speed that up to 65 mph and it drops to around 8mpg, add mountains in and it goes way down.  The lighter 5 and 6 speed W series coaches probably get a little better, the heavier ones get worse.
 

Bill N

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Jan 4, 2014
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Ozark, Missouri
My 2002 Winnebago Adventurer 35U with the 8.1 Vortec and the W22 chassis gets between 5 and 7.5 depending on terrain, wind and whether it is in overdrive or not.  Once I was on flat highway for the entire day driving at 62 mph and was disappointed to see that I only got 6 mpg but then remembered the generator was also running most of that very hot day.  So in a nutshell - it will vary but doubt you will ever get over 7.5.  I am happy if I get 6 consistently.  I am not sure of generator fuel useage per hour but feel that it is not minimal.

Bill
 

Mark_K5LXP

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Nov 17, 2018
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Location
Albuquerque, NM
Itasca Sunova 30ft, 7.2mpg nominal.

Tuneup?  What engine made in the last 20 years is "tuned up"? 

Some serious head work, headers, intake, tweaked ECM and a different bumpstick might net you a 10% increase which sounds like a lot but going from low 7mpg and change to high 7mpg and change hardly seems worth it.

Mark B.
Albuquerque, NM
 

Gary RV_Wizard

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Feb 2, 2005
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Location
West Palm Beach, FL
Most coaches built on that chassis family get 7-8 mpg. The larger/heavier W24 version carries bigger coaches and is typically a bit less, so 6-7 mpg.

Driver factors (speed and acceleration) and roads (town vs interstate) are major factors and can easily cause a 1.0-1.5 mpg difference.
 

Arch Hoagland

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Jul 11, 2014
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4,029
Location
Clovis California
My 2004 36 foot Workhorse chassis with the 8.1 engine has averaged 7.1 MPG over the past 90,000 miles pulling a 4,000 lb toad. That's hand calculated. 

Every gallon of gas I've put in it has been logged on a clipboard I keep by the drivers seat. It also serves as a trip history log...I can tell you where we were at any given time for the past 14 years.



 
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