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Old 06-02-2010, 10:33 AM   #15
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1968 17' Caravel
Battle Ground , Washington
Join Date: Dec 2002
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No matter how fast you drive, there will always be people who just have to get ahead of the RV. You can never go fast enough for them. I ignore them all. Find the speed you're comfortable with and stick with it.


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Old 06-02-2010, 10:53 AM   #16
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1976 Argosy 24
-- , Georgia
Join Date: Jun 2007
Posts: 559
We tow our Argosy between 55 and 60 mph.

We just completed a trip to Kentucky and back in our motorhome. 55mph except on longer hills when I turned off overdrive and set the cruise on 50 mph. We received 1 small air blast from a passing tractor trailer at 55mph. Otherwise, no rude comments that I noticed.


1976 24' Argosy
1973 International Harvester Travelette 1210 4x4 'Bernard' 164" WB
1997 Georgie Boy 30' SuperDuty v10
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Old 06-02-2010, 11:05 AM   #17
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2005 22' Safari
Gresham , Oregon
Join Date: Jul 2008
Posts: 73
I usually try to keep it under 65 miles per hour. I don't thinkt ST Tires are built for anymore speed than that. jc
2005 22 ft Safari LS
2009 Toyota Tundra
Hensley Hitch
Lifeline AGM's
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Old 06-02-2010, 11:06 AM   #18
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2006 16' International CCD
Niagara Falls , New York
Join Date: Aug 2006
Posts: 20
We do 60-62 max. Mileage drops off fast when you go fast. It's safer with the trailer too.
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Old 06-02-2010, 11:22 AM   #19
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projector's Avatar
1972 23' Safari
NSB , Florida
Join Date: Jan 2010
Posts: 134
Originally Posted by argy View Post
Another consideration, in addition; how large is your fuel tank? You may find your range severely limited. If you need to use your roof air and the onan, you can probably count on not much improvement in mileage or possibly less over engine air alone. The limitation is that your generator feeds of the vehicles tank and can only access from the top half of the tank or so so you don't get stranded at the campground. Hopefully you have the 50 gal.
We have a 50 gallon tank. The generator needs some work from sitting so roof air while running is out for now, and of course the dash air isn't working. A wonderful combination for Florida summers.
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Old 06-02-2010, 11:51 AM   #20
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1965 22' Safari
Vassar , Michigan
Join Date: Jun 2009
Posts: 847
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We run around 62 on the freeway. TV is an 09 Silverado 4x4 w/5.3 gasser. We get 14 mpg all day long until a head wind. Not bad but remember our 65 vintage 22' Safari is not very heavy.....Tim
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Old 06-02-2010, 12:16 PM   #21
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2005 25' Classic
Austin , Texas
Join Date: Jun 2008
Posts: 346
We run between 55 and 65 normally. If not in a big hurry we try not to go much faster than 60. At 70, which I think really too fast for the A/S tires, the mileage drops 3 to 4 MPG as compared to the 14 to 15 we get when holding between 60 and 65.

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Old 06-02-2010, 02:36 PM   #22
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2000 34' Limited
1979 31' Excella 500
Miamisburg , Ohio
Join Date: Apr 2006
Posts: 145
Usually in the middle lane at the prevailing speed with the usual caveats about safety, stopping and sight distance. I keep everything in top shape and the tires hard, never had an issue (knock on wood) with the running gear.

"If you've towed something at 100mph,,,you might be a redneck" Jeff Foxworthy
'00 34' Classic Limited (LOVSHAC)
'12 3500HD, 4x4 LBZ D/A CC LB
AIR #12881
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Old 06-02-2010, 02:43 PM   #23
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1971 25' Tradewind
Menlo Park , California
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Originally Posted by projector View Post
\I'm sure we'll get many one-finger salutes.
California's speed limit for trailers is 55 mph; I generally tow at less than 60 mph for both mileage and safety reasons.

- Bart
Bart Smaalders
Menlo Park, CA
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Old 06-02-2010, 03:27 PM   #24
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2000 31' Land Yacht
Central , Florida
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Speed is set at 65, flat land, have found overdrive and cruise control don't make for best mileage, I shut off cc when hills are numerous. I try to keep rpm's over 2000. when cc is on it will kick down two gears instead of one as it seems to be in a hurry to get back to set speed.
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Old 06-02-2010, 04:51 PM   #25
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1972 31' Sovereign
Lexington , Minnesota
Join Date: Feb 2009
Posts: 3,159
We experimented with towing at 55, 60, and 65mph. There was virtually no difference between 55 and 60. At 65 we went down about 4 mpg over the other 2. Therefore we tow at 60mph. That's with our Excursion and Starstream 24fter. When we towed the A.S. home for AL., we towed 55 or 60 due to worry about blowing those old tires, which didn't happen fortunately. We got about the same mileage wise for her too. We'll re-experiment when we get the A.S. back on the road especially since we'll probably have a new tow vehicle around that time frame too.
You should always tow for the conditions and be safe!
The joy is in the JOURNEY!

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Old 06-02-2010, 05:49 PM   #26
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1954 22' Flying Cloud
1954 25' Cruiser
2005 25' International CCD
Paradise , Texas
Join Date: Jan 2003
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We did the speed experiments too. These are towing the 05 CCD. With the 460 gas engine and 4.10 gearing the sweet spot was about 62-65, I can't remember what the rpm was at that speed but it was right at published peak torque for the motor. At 70 the fuel economy would drop to about 8mpg from 9.5 to 10mpg.

With the 6.0 diesel it likes 67 to 70. Fuel economy is worse at 55-60 than at 70. RPM is right at 2,000. Fuel economy drops off above 2,000 rpm to about 10 from 11.5-12mpg

Stress wise, we prefer 65-70. You don't get a bunch of crap from the other drivers and you are moving fast enough so as not to get drowsy. We also run the ST tires at 10psi above the pressure for the load rating as per Goodyear's instruction for running between 66-75mph.
Paul Mayeux
A&P Vintage Trailer Works, Inc.
AirForums #1565
WBCCI #7162
Heart of Texas Camping Unit
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Old 06-03-2010, 07:53 PM   #27
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1984 31' Airstream310
Lubbock , Texas
Join Date: Feb 2010
Posts: 301
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Thumbs up What's Your Interstate Speed

My cruise is about 64 MPH or depending on wind and load, just below the area that the power section of the quadrajet opens up.

A Man has got know his limitations-Dirty Harry
That's Some Bad Hat Harry-Jaws 1978
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Old 06-03-2010, 08:59 PM   #28
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1975 27' Overlander
High River , Alberta
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Posts: 385
65 mph, hills and headwinds permitting. Get about 16 mpg most of the time. Crossing the country, especially SD, WY, and MT, I would run 75 if the trailer had LT tires and the tow vehicle had more engine.

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