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Old 06-10-2013, 07:00 AM   #29
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Old 06-10-2013, 11:57 AM   #30
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Your Airstream is designed to tow with full water.

The biggest reason is that it lowers the center of gravity, making the trailer more stable on curves.

Next reason, and perhaps the best reaso, is what would you do, if your tow vehicle blew a water hose??

Easy answer, the trailer has the water ready for use.

Tape up the broken hose with duct tape, refill the radiator, put the cap back onBUT, do not tighten the cap. You may have to stop every few miles to continue, until you can get the break repaired, but guess where you can get all that water, without any outside assistance.

Safe traveling towing a trailer, has many little kind of things that most people never think of.

But, one big one is, ALWAYS FULL OF WATER.

The loss in fuel economy is so small that it's difficult to even measure.

Andy
Part of this is anything but true! I won't argue with the stability and convenience benefits (I travel with water when it makes sense), but GM engineering has evaluated that a 10% reduction in curb weight reduces fuel consumption by 6.5%.

You will have to do the math for your particular rig, but accelerating and moving mass DOES COST FUEL! Worth it? Only you can answer that for your own situation.
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Old 06-10-2013, 02:08 PM   #31
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30 gallons of water weighs @ 240 pounds. Considering your TV and trailer weight is some 10-11,000 pounds. I doubt that you will see any difference in the mileage when towing with a full FW tank.
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Old 06-10-2013, 02:16 PM   #32
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I haved towed with both full and empty water tanks and have seen no measurable differance in fuel usage.
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Old 06-10-2013, 02:23 PM   #33
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Do the math, it comes out to tenths of an MPG based on GCW, Mileage towing,amount of water capacity, anything in black and gray. Higher GCW, less of an effect on a percentage basis.

It is a hard number based in fact....thus the effort to reduce mass through lighter high strength steel and composites. Automakers wouldn't do it...more expensive....if it didn't matter. But 2016 CAFE requires it. Lighter cars and trucks save fuel consumption in the formula stated.

Again, you decide if it is worth it. But to say it has no effect is a disservice and flies in the face of physics.
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Old 06-10-2013, 02:26 PM   #34
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30 gallons of water weighs @ 240 pounds. Considering your TV and trailer weight is some 10-11,000 pounds. I doubt that you will see any difference in the mileage when towing with a full FW tank.
That is true in some cases, but I have 59 gallons + 6 in the HWH + a couple in the lines X 8.2# = 549#s.

BUT, 549# affects a solo 5500# vehicle which gets 17.5 mpg in a more impactful way than 549# affects my 16,000 GCW rig at 9.5 mpg (6.0 liter gas engine comparison)

The math is the math
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Old 06-10-2013, 03:11 PM   #35
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In the desert southwest, we always tow with a full fresh water tank; and we also carry a portable, 7-gallon emergency supply. Water is as important as fuel when traveling in 115-118+ degree weather. Besides, you never know when you'll find a good boondocking spot; and an empty tank will cut your camping time short.
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Old 06-10-2013, 04:31 PM   #36
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Do the math, it comes out to tenths of an MPG based on GCW, Mileage towing,amount of water capacity, anything in black and gray. Higher GCW, less of an effect on a percentage basis.

It is a hard number based in fact....thus the effort to reduce mass through lighter high strength steel and composites. Automakers wouldn't do it...more expensive....if it didn't matter. But 2016 CAFE requires it. Lighter cars and trucks save fuel consumption in the formula stated.

Again, you decide if it is worth it. But to say it has no effect is a disservice and flies in the face of physics.
What math?

I understand that GM is a huge Corporation, BUT, what do they know about the aerodynamics of an Airstream trailer??

I totally disagree with their math, as that is not what my many thousands of miles of towing experience demonstated.

My first hand experience showed that is near impossible to tell the difference of mileage when towing an Airstream, with 60 gallons of water, or none, under normal conditions. Normal is not mountain climbing.

Perhaps GM was refering to flat fronted trailers.

Andy
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Old 06-10-2013, 05:27 PM   #37
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This is strictly a weight calculation. 500 pounds of water doesn't care if it is in a square box or a torpedo. Mass is mass. Certainly the aerodynamics of an AS holds a lower drag coefficient.....that has nothing to do with mass penalties.
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Old 06-10-2013, 05:43 PM   #38
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I bought my Airstream to allow maximum comfort when I travel. When I stay with friends, I spend the night in my own bed. I use my own bathroom and my own shower. Some of us use our trailers for different purposes, but I always fill my water tank before I leave home. If I know I've got campground reservations I may not fill every day, but for my money, I can do without just about anything but water!
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Old 06-10-2013, 05:46 PM   #39
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And I do too, sometimes. For me convenience or time of arrival at the next stop dictates a full tank when I leave home. Other times it is just 10 gallons or so...for the potty and watering the dog, etc. I don't worry about the "slosh" factor in the flatlands....in the mountains probably should be full or empty.
I also do realize the convenience comes with a bit of a price in fuel consumption.....well worth it sometimes for me.
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Old 06-10-2013, 05:50 PM   #40
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if I were worried about mpg I would not tow anything and drive a hybrid.
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Old 06-10-2013, 05:53 PM   #41
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if I were worried about mpg I would not tow anything and drive a hybrid.
Oh, I agree, but some here want every 1/10 of an MPG they can squeak out. For those folks, a full tank carries and energy penalty.
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Old 06-10-2013, 06:09 PM   #42
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I can tell you from 82k miles of towing my 30' safari with a 8.1 liter suburban with a full water tank vs empty makes no difference in mileage!
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