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06-02-2010, 05:30 AM
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#1
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3 Rivet Member
1972 23' Safari
NSB
, Florida
Join Date: Jan 2010
Posts: 139
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What's your interstate speed
We're taking our '75 26 Argosy MH on it's longest trip to date since we got her. All mechanicals have been tended to: tune up, carb rebuild, transmssion service, coolant flush, remote air cleaner, fuel sender rebuild etc. This will also be the first trip where we will be on the interstate instead of local state roads.
So what's your comfortable and efficient interstate cruising speed? I'm assuming there's an MPG drop as some speed...somewhere in the mid 60's?
thanks
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06-02-2010, 05:36 AM
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#2
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Rivet Idiot
1999 34' Excella
Currently Looking...
Currently Looking...
On The Lake
, Georgia
Join Date: Apr 2009
Posts: 1,000
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Usually 65. May be a little higher or lower. I get around 12 MPG with the Chevy and 13.5 with the Ford.
__________________
Annette
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06-02-2010, 05:51 AM
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#3
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Retired.
Currently Looking...
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, At Large
Join Date: Jun 2003
Posts: 21,276
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If you're looking for most fuel efficient speed, 52 is about the best, but be prepared for a lot of one fingered salutes... There's a reason the highway mileage for cars and trucks is tested at 50.
Probably the best speed/mileage speed would be 60-62. With our Burb and trailer combo, we get 8.2 at 60-65 mph At 75 we get 6, so it drops off pretty fast.
Of course, we get 9 without the trailer...
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
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06-02-2010, 06:21 AM
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#4
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Rivet Master
1958 26' Overlander
Mesa
, Arizona
Join Date: Jul 2004
Posts: 1,742
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We tow between 60-65mph. I had a blowout once on my Excursion towing at 70mph and will never do that again.
__________________
1958 Overlander
2011 Wolf Creek 850N TC
2011 Ford F-250 Crewcab (6.2L), 3.73RE
WBCCI #5661/AIR #5661/TAC # AZ-6
4CU 1st VP
My '58 Overlander Restoration and Travel Blog:
https://mellomikesairstreams.blogspot.com/
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06-02-2010, 06:29 AM
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#5
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Rivet Master
1977 27' Overlander
Trotwood
, Ohio
Join Date: Jul 2007
Posts: 2,153
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I agree with Terry. About 60/62 and let the rest of them go burn up all that fuel. Just keep right to avoid some of the one fingered salutes and the rest are just showin you thier IQ.
Relax and enjoy the ride.
__________________
Roger & MaryLou
___________________
F350 CREWCAB SW LONG BED
7.3 liter Power Stroke Diesel
1977 27ft OVERLANDER
KA8LMQ
AIR # 22336 TAC- OH-7
May your roads be straight and smooth and may you always have a tailwind!
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06-02-2010, 06:29 AM
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#6
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Moderator
2006 19' International CCD
Olathe
, Kansas
Join Date: Oct 2009
Posts: 4,224
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60-65 for me in the rh lane. Better mileage and it keeps me from having to slow down/speed up as much or having to pass a semi. Also with a single axel it's safer for me and everyone around me. it's amazing how much better mileage you get @ 60 mph. Have a fun and safe trip.
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06-02-2010, 07:11 AM
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#7
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Moderator
2015 25' FB Flying Cloud
2012 23' FB Flying Cloud
2005 25' Safari
Santa Rosa Beach
, Florida
Join Date: Jul 2006
Posts: 13,159
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We do about 65 mph on the interstate. Downhill we hit about 70, and on an uphill, we're usually down to about to about 60.
Brian
__________________
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with ProPride
2020 Silverado 2500 (Vivian)
2023 Rivian R1T (Opal)
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06-02-2010, 07:15 AM
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#8
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Rivet Master
1972 Argosy 20
Middletown
, New Jersey
Join Date: Nov 2006
Posts: 589
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I keep it at between 60 and 65 , though sometimes my heavy size 13s does make it creep up a tad...
__________________
Bob Fowler
Some people are like Slinkies. They're really good for nothing, but they still bring a smile to your face when you push them down a flight of stairs.
TAC - NJ-007
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06-02-2010, 07:16 AM
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#9
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Rivet Master
1993 25' Excella
Full Time
, Anywhere USA
Join Date: May 2003
Posts: 2,708
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We set the cruise control at 62. Towing at this speed in the flat states we get 17 mpg and in the mountain states 13.5 mpg. (2008 GMC 2500HD)
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Michelle & Leon
New England Unit
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06-02-2010, 07:18 AM
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#10
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Rivet Master
2008 22' Safari
Oracle
, Arizona
Join Date: Oct 2007
Posts: 1,174
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60-65 and we avg 16 mpg if don't have a headwind.
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06-02-2010, 08:14 AM
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#11
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4 Rivet Member
1989 25' Excella
1989 34.5' Airstream 345
Hobe Sound
, Florida
Join Date: Aug 2006
Posts: 294
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62
After we started to travel in our MH (1st one a 26' 77 GMC and now our 89 345) have settled pretty much on 62. Seems not to increase much time, and the fuel savings is substantial. Example, from home here in SE Florida to New Mexico I figured mabe an extra 4 hours travel! Even towing a 66 Tradewind with then our 2500 Suburban, followed much the same speeds. If we have a 2-3 hour run and are late, 70 is no problem, but sucks the fuel.
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06-02-2010, 09:13 AM
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#12
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3 Rivet Member
1972 23' Safari
NSB
, Florida
Join Date: Jan 2010
Posts: 139
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Thanks for all the replies. We're looking at a 3 hour drive with normal driving and I think about 2 hours of it is interstate. I'm tempted to be more conservative driving there and more aggressive on the return to see what the difference it. And we'll be on I-4 through Orlando on a Friday afternoon so I'm sure we'll get many one-finger salutes. Makes me want air horns.
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06-02-2010, 10:18 AM
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#13
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Rivet Master
1970 27' Overlander
Espanola
, Full Timer
Join Date: Jun 2007
Posts: 1,753
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Quote:
Originally Posted by Mikethefixit
I agree with Terry. About 60/62 and let the rest of them go burn up all that fuel. Just keep right to avoid some of the one fingered salutes and the rest are just showin you thier IQ.
Relax and enjoy the ride.
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.......................and dye your hair white, get a old straw hat and corn cobb pipe with a checkered shirt and keep looking straight ahead...also move your mouth like your missing your false teeth ha ha!
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06-02-2010, 10:33 AM
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#14
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2 Rivet Member
Join Date: Jan 2003
Posts: 38
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You have a pretty good consensus going here. We have found over the years that we settle into a sweet spot between 58 and 62. We tend to drive some long distances. With our rear, we're running at 2850 -3000 at those speeds. I must confess the ride really smooths out over 70, but over the speeds mentioned here we drop about 2 mpg. That's a lot when your getting 9-10 mpg at best.
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.
Hope this helps
Keith
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06-02-2010, 10:33 AM
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#15
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Moderator
1968 17' Caravel
Battle Ground
, Washington
Join Date: Dec 2002
Posts: 12,255
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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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Stephanie
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06-02-2010, 10:53 AM
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#16
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Incorrigible
1976 Argosy 24
--
, Georgia
Join Date: Jun 2007
Posts: 559
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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.
__________________
Tim
1976 24' Argosy
1973 International Harvester Travelette 1210 4x4 'Bernard' 164" WB
1997 Georgie Boy 30' SuperDuty v10
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06-02-2010, 11:05 AM
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#17
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2 Rivet Member
2005 22' Safari
Gresham
, Oregon
Join Date: Jul 2008
Posts: 73
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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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06-02-2010, 11:06 AM
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#18
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2 Rivet Member
2006 16' International CCD
Niagara Falls
, New York
Join Date: Aug 2006
Posts: 20
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We do 60-62 max. Mileage drops off fast when you go fast. It's safer with the trailer too.
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06-02-2010, 11:22 AM
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#19
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3 Rivet Member
1972 23' Safari
NSB
, Florida
Join Date: Jan 2010
Posts: 139
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Quote:
Originally Posted by argy
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.
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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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06-02-2010, 11:51 AM
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#20
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Rivet Master
1965 22' Safari
Vassar
, Michigan
Join Date: Jun 2009
Posts: 848
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Speed
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
__________________
Tim
TAC MI 14
Everyday is a Saturday
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