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8.1 Liter Engine in RV - MPG?


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#1 gypsydan

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Posted 02 May 2013 - 08:26 AM

Starting in 2001, workhorse offered the 8.1 liter as an option.  I'm looking at buying a 31' Fleetwood, with a 16,000 gvwr.  I am curious as to what kind of experience others have had with this engine, particularly what kind of MPG you got? 

 

Thanks in advance.

Dan

 



#2 Fred and Bonnie

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Posted 02 May 2013 - 11:52 AM

Dan, I am happy with 7 to 7.5MPG.  Keep in mind our unit has a 24000 GVWR, which will impact the mileage.  In addition the unit you are looking at will have a GM 4 speed transmission, where ours is an Allison 5 speed.   I would be more concerned with the coach maintenance records and appearance, rather than MPG, as large MH don't get great mileage.

 

fred


Edited by Fred and Bonnie, 02 May 2013 - 11:54 AM.

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#3 Bill Joyce

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Posted 02 May 2013 - 12:09 PM

Our 2002 gas motorhome had the 8.1 liter and it was a good engine with the 5 speed Alllison transmission.  It averaged about 7mpg over the time we owned it and that was over about 33,000 miles.  Our motorhome was right at its weight limit of 22,000 lbs and we towed a 3,500lb Honda CRV.  Our year hated 10% alcohol in the fuel, it would lose mpg, but I was told the newer ones were better that way.  We could take mountain grades better than many older diesels, but not as well as a newer diesel.


Edited by Bill Joyce, 02 May 2013 - 12:10 PM.

2004 40' Newmar Dutch Star DP towing 2012 AWD Chevy Equinox, Fulltimer since July 2003
Travels - http://www.sacnoth.com - Bill, Diane and Evita (the cat)
Despite the high cost of living, it still remains very popular. (stolen from Nick Russell)


#4 alan_s

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Posted 02 May 2013 - 06:02 PM

I have a 2001 24' Winnebago with the 8.1 liter engine. The motorhome weighs 11,500 and I tow a 3,000 lb. mini pickup truck. I have kept track of all of the gas that I have put in it for almost 8 years now, and my long term mileage over all kinds of terrain is 8.9 mpg. I drive it pretty carefully, and rarely exceed 65 mph.


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2001 Winnebago 24' Class C - 8.1 Liter Vortec


#5 TheDuke

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Posted 03 May 2013 - 05:56 AM

I have the same unit as Alan but I don't tow. Down hill with a tail wind I can get 10. Usually 9 to 9.5 as long as I remember to change or clean the air filter.



#6 Epinephrine

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Posted 03 May 2013 - 07:19 AM

I have 2002 37 ft Pace Arrow with same engine and Allison trans. and get 7 mph. Same mpg towing toad or not. !

#7 gypsydan

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Posted 03 May 2013 - 07:40 AM

Our year hated 10% alcohol in the fuel, it would lose mpg, but I was told the newer ones were better that way.

I have heard this before. Any idea why?  Did you use reg unleaded? This of course is problematic. as most all regular unleaded has alcohol in it.



#8 gypsydan

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Posted 03 May 2013 - 07:47 AM

I have a 2001 24' Winnebago with the 8.1 liter engine. The motorhome weighs 11,500 and I tow a 3,000 lb. mini pickup truck. I have kept track of all of the gas that I have put in it for almost 8 years now, and my long term mileage over all kinds of terrain is 8.9 mpg. I drive it pretty carefully, and rarely exceed 65 mph.

 

 

I have the same unit as Alan but I don't tow. Down hill with a tail wind I can get 10. Usually 9 to 9.5 as long as I remember to change or clean the air filter.

 

As I thought.  The lower the weight, the higher the MPG, especially wit hthe torque the 8.1 generates.  I should (fingers crossed) get around 8 mpg.  

 

I am still negotiating for the unit,  so I hope to see every one on the road, especially at Gillette.



#9 Bill Joyce

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Posted 03 May 2013 - 09:52 AM

I have heard this before. Any idea why?  Did you use reg unleaded? This of course is problematic. as most all regular unleaded has alcohol in it.

I think they had to upgrade the engine computer to detect it was not standard unleaded to compensate for the changes.  It is not free to add alcohol to gas, farm states love it but alcohol has less energy per gallon than pure gasoline.


2004 40' Newmar Dutch Star DP towing 2012 AWD Chevy Equinox, Fulltimer since July 2003
Travels - http://www.sacnoth.com - Bill, Diane and Evita (the cat)
Despite the high cost of living, it still remains very popular. (stolen from Nick Russell)


#10 The Quiet Assassin

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Posted 03 May 2013 - 12:39 PM

Ours in the Trek got between 8 and 9 mph at 55mph.

 

Why go faster? Watch the roses grow!


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