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Topic: Fuel Mileage on 8.1 Workhorse

Posted By: burgess001 on 07/21/21 09:54pm

I drove DP's for years. Thinking about a 30 ft Workhorse. What kind of gas mileage can I expect


Jerry and Katie
More than 20 great years motorhoming and still loving it...
2004 DSDP 3810 (more than I needed...less than I wanted)
2004 Trailblazer (too heavy but well worth dragging)


Posted By: MitchF150 on 07/21/21 10:41pm

Single digits..


Posted By: Janss on 07/22/21 12:02am

We usually get 7.x mpg with our 8.1 Workhorse. Don't know if a newer motorhome than ours would be any better.


2002 Itasca Suncruiser 32V
2012 Suzuki Grand Vitara


Posted By: wildtoad on 07/22/21 04:48am

It will get better mileage than a Ford V10. But MitchF150 has an accurate and concise answer. When I had a Workhorse on a 30ft depending on conditions got low 8’s to mid 9’s.


Tom Wilds
Blythewood, SC
2016 Newmar Baystar Sport 3004
2015 Jeep Wrangler 2dr HT


Posted By: wa8yxm on 07/22/21 04:50am

MPG varies depending on several factors. The RIG below is a Damon Intruder 377W they call it 37' I call it 38, 8.1L workhorse
I"ve seen 6 or less (headwind) and I've seen 13.8 (Ok so the tumble weeds were passing me doing about 100 MPH, I'm not kidding that was one 7734 of tail wind)

Normally about 8 Fresh wax job and no towed I hit 11

The freshness of the wax job seems to make a big difference.


Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times



Posted By: rgatijnet1 on 07/22/21 05:01am

8MPG is a good average to use. In the Western mountains, and with a toad, I sometimes got as low as 5. To tell the truth, I never really worried about fuel mileage. The 8.1L and Allison transmission got me through every mountain pass and never missed a beat. Plenty of power to climb and keep up with traffic.


Posted By: fyrflie on 07/22/21 08:55am

2001 Fleetwood Flair 32 foot with 2000 Jeep Wrangler tow vehicle.
June 2021 trip from California to Tennessee and back. 5700 miles.

6.8 - 8.5 mpg @ 70 mph most of the time


Posted By: Rick Jay on 07/22/21 09:07am

Hi,

As others have said, I'd expect anywhere between high 6's to low 9's, depending upon terrain, wind, speed, towing/not towing, running the generator and whether or not you put "real gas" into it or the 10% ethanol junk many of us are forced to use.

While it probably doesn't matter too much to the answer of your question, out of curiosity, are you looking at a W-series Workhorse or a P-series Workhorse?

~Rick


2005 Georgie Boy Cruise Master 3625 DS on a Workhorse W-22
Rick, Gail, 1 girl (27-Angel since 2008), 1 girl (22), 2 boys (23 & 20).
2001 Honda Odyssey, Demco Aluminator tow bar & tow plate, SMI Silent Partner brake controller.



Posted By: Sandia Man on 07/22/21 09:09am

It depends, 7-8 mpg is the average, 5-6mpg in the mountains at elevation, 9-11mpg on the flatlands near sea level. Been using gassers for 3 decades of RVing and have never cared to actually calculate mpg, our current Class A has the 8.1L with Allison 2100 on W24 chassis, it has no problem traversing the many inclines we have here in the mountain west region. Both DIC on our Monaco and our Scangauge2 report MPG tallies which I have very little interest in, we love RVing and don't fret the costs to partake in this beloved endeavor.


Posted By: ReneeG on 07/22/21 09:52am

MitchF150 wrote:

Single digits..

I had to chuckle at this answer due to our past situation. We HAD a gas truck to tow our 35' FW, got 7mpg!! 7 . . . switched to diesel and in the double digits now.


2011 Bighorn 3055RL
2011 F350 DRW 6.7L 4x4 Diesel Lariat and Hensley TrailerSaver BD3
1992 Jeep ZJ and 1978 Coleman Concord Pop-Up for remote camping
Dave & Renee plus (Champ, Molly, Paris, Missy, and Maggie in spirit), Mica and Mabel, both Rat Terriers!



Posted By: Mike W on 07/22/21 02:07pm

Curious and kind of related. What criteria do you all use to calculate fuel stops? Yeah, gas gauge is a pretty good indicator. But for those who don't dwell or calculate MPG a lot...?


1987 Executive Diplomat 35
Sad Days
Sold my baby
">



Posted By: dodge guy on 07/22/21 03:58pm

Most class A gas tank are 80 gallons. So at 6 mpg you can go 120 miles to a 1/4 tank. I start looking for a station at 1/4 tank. Out west I’ll start looking at 1/2 tank because it can be pretty far between stations out there.

Realistically you can easily go 400 miles before you need to fill up. But you will have to stop before you ever need gas!


Wife Kim
Son Brandon 17yrs
Daughter Marissa 16yrs
Dog Bailey

12 Forest River Georgetown 350TS Hellwig sway bars, BlueOx TrueCenter stabilizer

13 Ford Explorer Roadmaster Stowmaster 5000, VIP Tow>
A bad day camping is
better than a good day at work!



Posted By: ArchHoagland on 07/22/21 05:08pm

I logged every gallon of gas I've bought over the past 95,000 miles and have averaged 7.1 mpg on my 2004 W22 36 foot coach pulling a 4,000lb toad.

Those miles almost always included going over mountains in the west.

I drive at 55 MPH to 62 MPH.

My tank holds 75 gallons and I calculate 420 miles at the most on a tank of gas although I always start looking for a gas station when I get down to a half tank or, especially when crossing a desert.


2004 Monaco La Palma 36DBD
Workhorse W22 8.1 Gas Allison 1000, 7.1 mpg

2000 LEXUS RX300 FWD 22MPG 4020 LBS
US Gear Brakes



Posted By: Rick Jay on 07/22/21 05:22pm

dodge guy and ArchHoagland,

I agree with your math and refueling policies. The only thing I'd add is that the height for the pick-up tube for the generator is usually set at about the 1/4 full mark on the gas tank. So if you are using the generator, you definitely want to be looking for fuel well before the 1/4 full point on the tank. And up and down hills might even cause it to start sucking air before that point is reached. In our rig we usually travel with the generator running to keep the family comfortable, so I used to fill up around the 325-350 mile point which seemed to work well for us.

~Rick


Posted By: dodge guy on 07/22/21 06:42pm

Rick Jay wrote:

dodge guy and ArchHoagland,

I agree with your math and refueling policies. The only thing I'd add is that the height for the pick-up tube for the generator is usually set at about the 1/4 full mark on the gas tank. So if you are using the generator, you definitely want to be looking for fuel well before the 1/4 full point on the tank. And up and down hills might even cause it to start sucking air before that point is reached. In our rig we usually travel with the generator running to keep the family comfortable, so I used to fill up around the 325-350 mile point which seemed to work well for us.

~Rick


Yes, I forgot to add that. Although I have ran the tank down to 1/8 and the generator still ran. But I was coming into Denver and filled right off I70 before I got into the mountains.
So yes, you have to know where the cutoff is for the generator fuel pickup.


Posted By: fyrflie on 07/23/21 09:45am

I have a 60 gallon tank and use 6 mpg as my baseline mileage.
Looking for fuel and beer around 300 miles.


Posted By: egh33 on 07/24/21 02:37pm

burgess001 wrote:

I drove DP's for years. Thinking about a 30 ft Workhorse. What kind of gas mileage can I expect


All depends on the tail wind, down hill is great gas mileage






Posted By: burgess001 on 07/31/21 11:14am

Thanks everyone. We did go with a V10 Class C. The Workhorses we found were pretty much used up.


Posted By: wa8yxm on 08/04/21 05:38pm

I drove a 2005 Damon Intruder 377W (Workhorse 8.1L) for 15 years
Millage. Lowest I ever got was 6 (Major headwind)
Highest 13.8 (I kid you not the tumble weeds were going down the road passing me at nearly 100 MPH Straight down the very straight (I-10) road.. Was ... Fun (not) when I exited for the night)

Normal depended on my towed. 7-8 towing a 2001 Dodge neon using a transmission lube pump (2500 pound towed)
8-9 towing a 1992 Chevy Lumina APV (4000 pounds) with a Axle lock. I do not knwo if this was because the larger APV "Spoiled" the air flow or the added drag of the automatic transmission on the Neon.
Bobtail (no towed car) about the same as with the Lumina (Argument for spoiled air flow)

Fresh Wax Job 10-11MPG
Anyone care to guess why I waxed spring and fall before my semi-annual migration hike?


Posted By: LouLawrence on 08/04/21 06:54pm

Why do we keep getting MPG questions? If you do even the most simple search you will find something like 1000 posts on MPG. None of them mean a dang thing since everyone has a different way of calculating this number (with generator, without generator, traveling East, Traveling West, Headwind, Tailwind and on and on ad nauseam). MPG is, by far, the least of all of any RVers concerns when it comes to cost of ownership.


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