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Old 08-21-2005, 09:01 AM   #1
Desert Fox
1985 31' Sovereign
Tucson , Arizona
Join Date: Jan 2004
Posts: 250
Post Looking at Land Yacht 1997

I have question to all . What kind of miles per gallon can I expect from a 30foot with 454 vortex motor? At present time we own a 1985 Sovereign and tow it with a 350 Vortex Chev. I ger anout 12 miles per gallon.
Is there anything I schould on the look out for?
Please send replies to
Thanks for all the help.

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Old 08-21-2005, 03:49 PM   #2
Rivet Master
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1978 31' Sovereign
Texas Airstream Harbor , Zavalla, in the Deep East Texas Piney Woods on Lake Sam Rayburn
Join Date: Jan 2003
Posts: 2,435
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In My Humble Opinion

8 would be great
7 might be obtainable
6 is realistic and probable
5 is the lower end
4 the lowest I experienced.

I'm anal about logging each and every gallon of gas - on all of the vehicles.

Anyone claiming 10 or 12 consistently on a 454 motor home either does not know how to fill the tank every time or doesn't know how to run a computer.

There have been reports here of 8.5 mpg's, but I'm pretty sure that was all at 50 to 55 miles per hour.

I get 6 to 7 (8 once or twice) at 55 to 60 mph.

Read this thread -

Do a search of related words including MPG and motorhome, you may discover a few more threads addressing this.


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Old 08-21-2005, 05:06 PM   #3
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1966 26' Overlander
Woodstock , Georgia
Join Date: Feb 2002
Posts: 8,084
I have been getting 7-8 and ocassionally 9 on my 28 footer. I have gotten 7 with the gen set running and towing my Saturn. I think also having the carb clean and tuned helps, and the ignition parts in good shape. and I use a dare I say it ...a "Tornado" air manager over the carb...yes I know many are sceptical but I still stand on feeling and seeing some positive gains since I have used this, about two yrs now. Sure Sam Memollo (sp) gets ads for it on his show, but he heavily endorses it also. Ok please gents lets not start the arguments...
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Old 08-23-2005, 08:47 PM   #4
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1994 30' Excella
Currently Looking...
Milwaukee , Wisconsin
Join Date: May 2004
Posts: 1,892
Alan- Check out this month's edition of Popular Mechanics. they review several of these type of gas saving devices, including the "Tornado."
Chaplain Kent
1994 30' Excella 1000, Chummy III- Ford Excursion- 7.3 Turbo-diesel
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