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07-29-2017, 10:55 AM
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#1
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Junior Member
Workhorse Chassis Owner
Join Date: Dec 2014
Posts: 9
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Gas Mileage Question
We have a 2003 RexAir 3750 RB with the 8.1 Workhorse. Our fuel mileage on the last trip was a mere 4.75 MPG.
Wondering what others are getting.
Cathy & John
2003 RexHall RexAir
toad 98 Jeep Grand Cherokee
Overbuilt lift for the RoadKing
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07-29-2017, 11:08 AM
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#2
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Senior Member
Join Date: Jan 2017
Posts: 134
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Quote:
Originally Posted by DJ JohnnyB
We have a 2003 RexAir 3750 RB with the 8.1 Workhorse. Our fuel mileage on the last trip was a mere 4.75 MPG.
Wondering what others are getting.
Cathy & John
2003 RexHall RexAir
toad 98 Jeep Grand Cherokee
Overbuilt lift for the RoadKing
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8.5MPG no toad. 2003 Pace Arrow 35G 8.1L Vortec
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07-29-2017, 11:16 AM
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#3
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,449
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First trip with a ; new to you coach ?
Or was fuel mileage on this trip worse that another trip on the same road?
Any generator use to factor in?
My own coach , economy can vary by 2.5 MPG , depending on , route ( highway conditions ; hills to climb ) and speed .
Easy, flat freeway driving , at 60 mph. 9.5 MPG , mountain roads in Idaho and Montana.  If I try to maintain speed in excess of 65, I might as well pour the fuel out on the road.
I know that my diesel coach mileage isn't what you want to compare to , but your speed, your coach and toad weight, and your route , play a BIG factor in your economy.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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07-29-2017, 11:22 AM
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#4
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Senior Member
Ford Super Duty Owner
Join Date: Dec 2009
Location: Mcdonough, Ga.
Posts: 5,932
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Quote:
Originally Posted by DJ JohnnyB
We have a 2003 RexAir 3750 RB with the 8.1 Workhorse. Our fuel mileage on the last trip was a mere 4.75 MPG.
Wondering what others are getting.
Cathy & John
2003 RexHall RexAir
toad 98 Jeep Grand Cherokee
Overbuilt lift for the RoadKing
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The Grand Cherokee is a very heavy vehicle. I normally tow a Honda Civic. A couple of times I pulled my son in laws jeep and my mileage went down. With that being said, Your mileage is low. At what speed do you cruise ? Do you floorboard it on hills. Driving habits do make a big difference. If you are a conservative driver this is low. Average MPG for your set up is usually in the 6 plus and up. Hook it up to a OBD ll reader and see if there are any codes.
__________________
1998 Pace Arrow 35 ft. F53 Ford V10 2014 Honda CRV toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.
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07-29-2017, 11:34 AM
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#5
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Senior Member
Join Date: Feb 2016
Posts: 665
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How many miles on your 8.1 last Tune Up Air Filter Plugs Plug Wires read all the post on the 8.1 you may find out a tune up is in order also clean the MAF
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Larry and Sheila 2008 Fleetwood Discovery 39R
Retired U.S. Air Force (SAC) Vietnam Veteran
2022 RAM 1500 5.7 HEMI
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07-29-2017, 12:19 PM
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#6
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Senior Member
Join Date: Aug 2016
Location: Pa
Posts: 648
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I have a 2004 35ft MH on the W-22 chassis (same 8.1 GM as you) and pull a Jeep Liberty so my total weight my be a little less than yours (my gross with toad is 25,600lb). My wife and I finished a 7000 mi trip this June from eastern Pa to Yosemite, Ca., out the southern route back the northern so we ran through all types on terrain. My overall gas mileage for the entire trip was 7.48 mpg and I stayed at 65-68 mph on interstate hwy but in the mountains I don't floorboard it instead hold it to around 3200 rpm.
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2004 Coachman Santara 3480DS Workhorse w-22 Ultra Rv tune with Banks headers, Koni shocks
Retired OTR driver ATA 5 million mile safety award
USMC Vet 1968-1972
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07-29-2017, 01:16 PM
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#7
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Member
Join Date: Jul 2017
Location: full timing the USA
Posts: 88
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I'd say almost all Class-A gasser's get between 7 to 10 depending on what if anything towed, terrain, and speed. Any less than 7 and it's time to look at a tuneup, any more than 10, means you probably have the rig for sale. 
It's been my experience having all types of motorhomes, C, A, Bus, that's the only time they get more than 10 mpg.
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07-29-2017, 01:38 PM
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#8
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Senior Member
Thor Owners Club Appalachian Campers Freightliner Owners Club RV Trip Wizard
Join Date: Mar 2017
Location: Lenoir City, TN
Posts: 710
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Our V10 is 6 to 9 depending upon all the factors mentioned. I can get over 10 if I only travel downhill. I do get a lot of fun per mile though. [emoji12]
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Greg, Gina & Ginger the rescue dog
2014 Palazzo 36.1, Cummins ISB 6.7 300hp, Allison 2500
TOAD 2008 Jeep Rubicon 4x4, Blue Ox Avail tow bar, RVi3 brake
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07-29-2017, 02:24 PM
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#9
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Community Administrator
Tiffin Owners Club
Join Date: Sep 2013
Location: DFW, Texas
Posts: 21,525
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In approximately 30,000 miles in our Itasca with an 8.1 Workhorse, we averaged about 6.2mpg overall. Sometimes it was 5 and other times it was 7 depending on road and wind. I did tend to run the speed limits up to 70mph.
__________________
 2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previous '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
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07-29-2017, 04:13 PM
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#10
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Senior Member
Winnebago Owners Club
Join Date: Dec 2015
Location: Chardon, Ohio
Posts: 433
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On a GOOD day we get 15-16mpg. Most days we get 6.9-7.7mpg. Oh, by the way, I've never seen a GOOD day !
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Bill, Maura & Rosie the rescued "Boston Terrier"
2016 Winnebago Adventurer 38Q-26K Chassis. TST 507 x10
2014 CR-V EX-L AWD w/Blue Ox & NSA Ready Brute Elite
NRA Endowment Life Member, FMCA 455593, WIT 170814 & Mid-Ohio Winnies
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07-29-2017, 05:46 PM
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#11
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Senior Member
Join Date: Nov 2013
Posts: 5,774
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I have a 37' Newmar with the 8.1 on the W24 chassis. I try to keep my speed at 60 mph towing a Chevy Malibu on a dolly. I average 7.5 on several trips including hills.
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2015 Tiffin Phaeton 40QBH
2018 Chevrolet Colorado Toad
Roadmaster Tow Setup
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07-30-2017, 06:59 PM
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#12
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Senior Member
Join Date: May 2015
Location: Silver Spring, MD
Posts: 602
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34 ft Tiffin 32SA - loaded for the weekend, 1/4th tank of water, pulling 3600 lb Malibu...6.92mpg.
__________________
2022 Imagine 22 MLE
2022 F150 Powerboost wi 7.2 KW
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07-30-2017, 08:22 PM
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#13
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Junior Member
Rexhall Owners Group
Join Date: Mar 2017
Posts: 18
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Avg 8-9 MPG with Toad
1996 Rexhall RexAir (36.5 ft) Ford V8 engine,  with a Jeep Wrangler toad is running 8-9 MPG through route from Canadian border, through NY state through mountains of Virginia, NC and SC.
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07-31-2017, 10:49 AM
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#14
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Member
Join Date: Jul 2017
Location: Newberg, OR
Posts: 84
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2006, 35ft sightseer with 8.1. Usually average 6.5-7.5mpg. I also tend to be heavy footed.
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