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Old 03-04-2004, 10:17 PM   #15
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1987 29' Sovereign
Sparta , Tennessee
Join Date: Mar 2003
Posts: 507
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2003 GMC 2500HD 4x4 Extended Cab short bed/fiberglas cover
6.0, 4spd auto, 4.10rear, 5500miles to date, 6500lbs.

16mpg interstate
11.8-12.2 towing 29' Sovereign at 6700lbs/ 58-62mph

12.0 around town

12.2 overall average by truck computer.

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Old 03-04-2004, 10:28 PM   #16
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Posts: 276
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2003 GMC 1500 HD
V-8 6.0 - Quadrasteer

When towing my 28' International CCD and staying at 65 miles per hour, I average between 10.5 and 12 miles per gallon.

When traveling at 75 miles per hour with the same set up, I am atround 9 to 9.5 miles per gallon.

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Old 03-05-2004, 01:07 AM   #17
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1984 29' Sovereign
Riverview , Florida
Join Date: Apr 2003
Posts: 64
1996 GMC Suburban 6.5L Turbo Diesel
1984 29Ft. Sovereign

16-17 Highway

13 Towing at 65MPH
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Old 03-05-2004, 03:53 AM   #18
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2004 30' Classic
Field and Stream , PA & MT
Join Date: Nov 2002
Posts: 819
2000 Ford F-250 7.3L PSD/auto/4WD regular cab long bed w/cap on back

I have been towing a 28' SOB getting about 10.5 mpg loaded, and I get about 18 mpg hwy empty.

I have a rather heavy foot on the accelerator, so I may be able to get a mile or so better mpg if I slowed down a bit!

I have a 30' Classsic Ltd on order, so we'll have to see how that effects my mileage. I purchased my truck new 4 years ago in burgandy and silver to match the Ltd's graphics, so I can hardly wiat until my new Airstream finally arrives!

I'm especially interested in anything any of you guys may have done in the way of performance enhancements to your tow vehicles to improve your mileage (such as computer chips, etc).

The only thing I've done so far is to put a standard K&N Air Filter on, but I think that only saves me the cost of replacement filters rather than increasing my mpg.

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Old 03-05-2004, 05:52 AM   #19
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Pittsfield , Maine
Join Date: Oct 2003
Posts: 1,099
Duramax Diesel

This question seems to come up ever so often but, for the record, I'm currently getting 17 mpg, highway, non-towing, using winter-blended fuel. I know from past experience that this will go up to 18+ using summer-blended fuel. Note in my signature that this is just about the heaviest stock GMC dually available. Others, with a short bed standard cab - or even with an extended cab - and without 4-wheel drive, are reporting better mileage. My truck has just a little over 10,000 miles on the odometer as of last weekend. I haven't towed enough with it to have any data for a loaded configuration. I may experience even better mileage this summer as many have reported a significant improvement in the Duramax mileage after about 12,000 miles on the odometer. Don't ask me why!

2003 GMC 3500 D/A, CC, LB, 4x4 and 2000 Airstream Excella 30. WBCCI 7074
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Old 03-05-2004, 07:05 AM   #20
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2002 31' Classic
Hillsboro , Texas
Join Date: Jan 2004
Posts: 307
Images: 11

When 6.0 Excursion was new, the fuel mileage was disapointing. I was told by many diesel owners, "MPG will increase as you get miles on the clock", it's true! I guess new diesel bearing tolerences are extreamly tight, as parts "wear-in", it sure makes a remarkable difference in performance and economy.

Over the years, I've had several new gasoline auto's but never noticed quite the swing in MPG over my ownership.

One note, I 'm impressed with overall honesty regarding MPG from this thread, we've all heard padded claims or "YOU SHOULD HAVE SEEN THAT FISH!
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Old 03-05-2004, 08:39 AM   #21
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Just filled up yesterday-Got 18.5 MPG solo. Usually get 13.5 towing.

BTW- 2000 Ford PSD, 60K on the odometer.

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Old 03-05-2004, 10:20 AM   #22
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Posts: 36
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My tow vehicle is a 1999 Chevy Silverado Z-71 1500 extended cab pickup. 5.3 litre , 280 HP, 3.73 axle.

Empty highway mileage not towing:18
Empty town mileage not towing:15
Towing mileage, 32' Excella, 68 MPH: 12

Cat scales says we weigh 12,870#.

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Old 03-05-2004, 03:17 PM   #23
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2004 25' International CCD
Salem , Massachusetts
Join Date: Jun 2003
Posts: 457
For us our DIESEL tow vehicle works great!

Vehicle: 2000 Ford Excursion, 7.3 Powerstroke, 2WD, 4.10 rear end ratio, 8,500lbs.

Airstream: 25' CCD, 6,300lbs.

Average MPG Not towing:
- Highway 16mpg
- Highway/city 15mpg

Average MPG Towing:
We usually pack our car pretty well, full crew and bikes, not to mention food/drinks! and even so our Big Boy barely feels the AS!

At 65mph highway speed and a few light hills the average mpg has NEVER gone below: 15mpg!

Diesel price here: $1.49!!

Pity we can't travel more.

Happy trails everyone!
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Old 03-05-2004, 03:49 PM   #24
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1972 31' Sovereign
High Springs , Florida
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2003 Short Bed, Extended Cab GMC 2500HD, with Duramax/Allison combo, 3.73 gears.

A solo trip to Florida from Ohio and back averaged 20.2 mpg.
A towing trip with the Airstream to Florida averaged 13.5 mpg.
I usually get around 18 commuting back and forth to work on Florida fuel. A trip to Daytona Beach on the backroads, from Gainesville, plus this weeks commute netted me 19.2 MPG. I am running a pre OEM Caterpillar fuel filter, plus I use FPPF Fuel Power diesel fuel treatment. I have Mobile Delvac 1300 15W40 in the crankcase. I also changed the rear end fluid and refilled with Mobil 1 gear lube.
2003 GMC 2500HD 4X4 D/A Ext. Cab
Propane Powered Honda EU2000i
Lots of Hot Sauce!
Air # 283
WBCCI 1350
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Old 03-14-2004, 06:42 AM   #25
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2007 25' Safari FB SE
1958 22' Flying Cloud
1974 29' Ambassador
Yucca Valley , California
Join Date: Jun 2002
Location: 1963 26' Overlander
Posts: 4,767
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1997 Chevrolet Suburban C1500 2WD, 3:73, 5.7 Vortec
hwy not towing: 17.9mpg
city/highway not towing: 14.5mpg
towing at 55-60mph: 12.5mpg combined
I tow a 1971 Tradewind, medium load.
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Old 03-14-2004, 07:14 AM   #26
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1993 21' Sovereign
Colfax , North Carolina
Join Date: Jun 2003
Posts: 20,355
Originally posted by Pick
2003 Short Bed, Extended Cab GMC 2500HD, with Duramax/Allison combo, 3.73 gears.

I also changed the rear end fluid and refilled with Mobil 1 gear lube.
I also went the Synthetic gear lube route, although not so much for improved mileage, but because these Dodges tend to chew up rear ends, and I am doing whatever I can to make mine last.
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
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Old 03-14-2004, 08:45 AM   #27
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2004 25' Safari
. , Illinois
Join Date: Feb 2003
Posts: 10,336
1996 Impala SS (2WD- posi)
350 LT1
4L60E trans
3.73 gears

19' Bambi (4600lb wet weight)- 10 mpg
!! Had 2.93 gears here)

25' Safari (6300lb wet weight)- not yet known
!! 3.73 now in

Not towing:

City- 13-15mpg
Highway- 24mpg (highest)/ 22mpg lowest
Results the same with 2.93 and 3.73 gears
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Old 03-14-2004, 09:36 AM   #28
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1998 Dodge Ram 2500 Cummins 5.9 litre 12 valve turbo diesel, LWB, 4x4, with quad cab. Based on 30,000 miles driving on the flat on east coast down I95 and in Florida in the winters:-
18 mpg solo with mixed town and highway.
17 mpg with rack, carrying 19 ft kayak on top.
14 mpg towing 6800 pound Excella 25 at 62 mph on highway, with kayak on rack also.
13 mpg towing 6800 pound Excella 25 at 70 mph on highway, with kayak on rack, also.
What a great machine! Nick.

Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."
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