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Old 06-11-2006, 08:37 PM   #29
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1984 31' Excella
Abernathy , Texas
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Originally Posted by klevan
I'm pretty sure he's talking to me... I asked you the low fuel mileage question, and if you thought the bed cover or the Banks contributed most to your sweet mileage numbers.

I'm only getting 13.3 pulling my 31' Sovereign at 65-72 mph in the wide open spaces of NM, AZ, and UT. In the mountains of CO, where average speed is more like 55-60, I still get 13.3. In four wheel drive dragging a Jeep on a trailer in and out of the wildereness, I get 13.3. Around town not towing, I get 13.3. I have never taken a road trip without a trailer, so I don't have data for non-towing highway. I have a 2005 4X4 Crew Cab, short bed,with fewer than 10,000 miles. Should I have the dealer check it out?
Ken Levan-
It's under warranty, so you have nothing to lose having the dealer check it.
Your tow mileage is about like mine when towing my 31 footer at 65-72 mph.
My in town mileage is a bit better than yours maybe, but I am broken in a little more than you are at almost 100K, and I have adjusted to driving with "the egg under my foot" methodology to keep from wearing out tires in only 20,000 miles per set on the rear.
This set has 30,000 on them and is about 1/3 tread left. The last set was gone on the back tires at 20,000 miles, but I was loving the torque pinning me to the seat.
I have a 20 minute commute at 70 mph down I-27 to see my clients, so my mileage daily is mixed city and highway and usually runs about 17 mpg. If I was city only, I might be 13-14 mpg. Like I say, I have toned down the jackrabbit starts and really go easy, and my tires are thankful.

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Old 06-12-2006, 07:18 PM   #30
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For the record my 2003 GMC, LB, 4x4, CC with Duramax/Allison and an A.R.E. tonneau cover on the bed averages just under 14 mpg with the 2000 30' Excella in tow and about 18.5 mpg solo at about 60 mph average. I can get 21 mpg, on the level, at 55 mph - but that's not a realistic scenario. My overall average, since I purchased the beast, is 14.9 mpg. I have a built-in bed load (generators, tonneau cover, custom bin and floor items, plus other camping gear, of around 750 lbs. The rigs overall weight, ready for the road, and including the hitch assembly, is right at 8,400 lbs - the same as the trailer - although the 18.5 mpg solo doesn't normally include the hitch assembly. I use Mobil 1 Synthetic but I don't believe that's a factor - contrary to others that swear by synthetics! I simply like the extended change interval (---usualy about 7,500 miles, regardless of the computer numbers) and I change the fuel filter with every oil change. Cheap insurance for a great vehicle! I get a sh-- eating grin on my face every time I fire it up for a trip! It's too bad that the fuel Gods have pushed diesel prices right up there alongside low octane gas.

As for the original topic regarding overdrive, I use the "tow/haul" mode religiously since a lot of my travels are in Eastern mountain ranges. It does switch to overdrive at about 57 mph, provided we're not climbing - but the most noticeable difference is in the lower gear shift points. The Allison transmission is simply something else - and what a joy on long downhill grades! The transmission will never allow the truck to "lug" in overdrive - but note that I'm only towing about 63% of my design capacity.


2003 GMC 3500 D/A, CC, LB, 4x4 and 2000 Airstream Excella 30. WBCCI 7074
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Old 02-22-2007, 12:05 PM   #31
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2005 25' International CCD
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Late post on last Summer's thread, and echoing another's comment -- I love my 2500HD! We opted for 8.1L (496!?) gas with allison 6spd, glas tonneau cover on back. Muscle truck! we get 13 mpg hiway towing CCD 25 and 18 mpg hiway solo. I think we get 6-9 mpg solo if we do errands in town, and the town miles just don't add up so who cares -- we love towing in our truck. While it seems nice we have capability to "manually" shift the allison we learned pretty quickly the transmission brain is way smarter than we so we just leave it in overdrive. holds 58 mpg at 1,500 rpm all day except for little excursions to 2,400 rpm for hills. cool
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Old 03-03-2007, 10:51 AM   #32
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1978 31' Sovereign
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I have a 2005 D/MAX, allison 4+4, I average abut 12.5 at 75 mph. Pulling 31 F
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Old 03-06-2007, 04:33 PM   #33
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Columbus , Indiana
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Originally Posted by balestrine
I have a 2005 D/MAX, allison 4+4, I average abut 12.5 at 75 mph. Pulling 31 F
not in the same league, but for the sake of comparison...
2003 1500HD, 6.0 gas, 4x4. 4-up in front and 31' Excella: worst tank 9mpg, best around 12.5, 11 is mean, median, and mode.
But only at 60mph. Hey, it's a vacation, if I wanted to be in a rush I'd have stayed at work, right?
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Old 03-06-2007, 06:01 PM   #34
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2004 25' Safari
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My 04 burb 4x4 w/ 6.0L and 4.10s ranges between 9.8 and 12.6 FWIW.....
Computers manufactured by companies such as IBM, Compaq and millions of others are by far the most popular with about 70 million machines in use worldwide. Macintosh fans note that cockroaches are far more numerous than humans and that numbers alone do not denote a higher life form. -NY Times 11/91
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Old 03-06-2007, 06:17 PM   #35
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1960 24' Tradewind
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Originally Posted by rebel beck
Gas will probably be $5 a gallon then.
That would be in parts of Canada. We are paying over a dollar a litre right now which equates to a tad over $4 Canadian for a US gallon, all rough calculations. The way things are going we'll hit that sad $5 mark soon enough.

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Old 03-06-2007, 07:31 PM   #36
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1991 35' Airstream 350
Jay , Oklahoma
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The price of fuel (diesel) makes one think of french fry grease, doesn't it?

Jeff & Cindy
'09 27FB Flying Cloud
'91 350 LE MH
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