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Old 11-14-2015, 06:44 AM   #29
Rivet Master
2013 31' Classic
billings , Montana
Join Date: Feb 2010
Posts: 1,179
I still don't see any of them old big gas burners on the highways any more, like the IH 549, 501's , the 28 Whites, the 427 Chevys haulin drill pipe from Texas going east....

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Old 11-14-2015, 07:18 AM   #30
3 Rivet Member
1978 31' Excella 500
Barrie , Ontario
Join Date: Dec 2012
Posts: 160
I pulled my 31'AS for years with my 1999 GMC 1500 in July 2014 I did a 7000 mi trip to the Yukon with no problems got about 11mpg. In Feb 2015 I bought a new 2014 GMC 1500 2wd regular cab long box its GCWR is 12000 lbs my GCWR on Cat scale is just over 11000 lbs and I get 15.5 mpg I set the cruise when possible and in tow haul it will hold at 60mph. My oldest son has an all dressed Silverado diesel that about 5 years old and he tows SOB and he told me he only gets 9mpg. I bought both my GMCs at end of year after the next years models were out you can get a good deal on a new truck that way. The dealer took $10,000.00 off the list price of my new truck. From now until Feb is a good time to check dealerships for a new leftover truck . I will be leaving at the end of Dec for a trip to Louisiana and FL will see how it does on that trip.

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Old 11-14-2015, 07:45 AM   #31

2003 25' Classic
Zanadude Nebula , WNY
Join Date: Jun 2007
Posts: 10,802
Images: 1
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I still love our 8.1.....

AF #1

"Sticks & stones can break your bones...and hail will dent your Airstream"

So when is this..."old enough to know better" supposed to kick in?
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Old 11-14-2015, 07:52 AM   #32
3 Rivet Member
2015 27' Flying Cloud
Washington , Washington, D.C.
Join Date: Jul 2014
Posts: 171
Now in Zion National Park, Utah. Having crossed the Continental Divide and having made most of the trip on non-Interstate highways (which tend to have steeper grades), we've found this combo to continue to work fine. The 400 mile rolling average fuel economy has varied from a low of 12 (rolling "uphill" to the Rockies) to 13.5. The real key to this truck's performance is the 8-speed tranny. 60 mph at 1750 rpm in 7th gear (typical cruising) and at 1400 in 8th (gentle downhills). When GM matches this tranny with the 5.3 engine, that will be a good combination. Have cleared mountain passes topping 9,000 feet and, while the engine loses power some, there's enough left to ascend at legal and prudent speeds, given the curves, etc. Grade braking works well and , while use of service brakes was needed once in a while, I never felt close to maxing out braking capacity and certainly never got them hot enough to smell. Again, the 8-speed really shines in this application.
A couple of response to other comments: auxiliary diesel tanks seem common. Auxiliary gasoline tanks not so much. I suspect that has to do with the volatility of gasoline and the need for vapor recovery systems. The Airstream Classic was a heavy trailer--10,000 GVWR, if memory serves. That's 2400 more pounds than my Flying Cloud and most that is in trailer weight, not cargo capacity, including 40 lb propane tanks in front rather than 30 in my case. Under those circumstances I might very well go to a one-ton (and diesel power) as well. When Ford puts an 8- or 9- speed tranny in the F150, I think it probably would be just as good as my truck. I'm betting that grade braking works better on my truck than on today's F150.

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