Tow Speed - Page 3 - Fiberglass RV


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Old 09-28-2010, 04:57 PM   #29
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Name: lee
Trailer: trailswest campsterl, 1996 Scamp 16 foot
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Originally Posted by mcbrew View Post
To add to my previous post: I got about 23-24 MPG towing our 13' Scampup to Gettysburg last weekend. This was our first trip with it, so I don't have that much experience. There are nothing but hills between here and Gettysburg. These aren't mountains (okay, they were a few million years ago), but a few hundred feet up and down, over and over has an impact on fuel economy.

In just under two weeks, we'll be taking a trip to Maryland's eastern shore for a weekend of camping. This is a much flatter drive. I hope to get 1 or 2 MPG better on this trip. I'm not all that disappointed with 24 MPG, but I wouldn't mind better fuel economy!
mcbrew What are you towing with? I want one !! Lee and Norma
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Old 09-28-2010, 06:27 PM   #30
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I think a lot depends on the specific car/shape. I know for my car, the AC on and the windows up clearly makes for worse mileage than driving with no AC and the windows down, but then I don't have a "used bar of soap" shaped car I suppose the more aerodynamic your car is, the more the windows-down might make a difference over the AC.
My point was that running the air conditioning costs a more than not running it. sometimes as much as several MPG.
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Old 09-28-2010, 06:34 PM   #31
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My point was that running the air conditioning costs a more than not running it. sometimes as much as several MPG.
Some info here.
Does Running Your Car's Air Conditioner Really Affect Gas Mileage
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Old 09-28-2010, 07:14 PM   #32
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A number of years ago somebody did some research and testing on A/C vs open windows vs gas mileage. If my memory serves right it was better to have the windows up and the A/C rather than fight additional drag caused by open windows.

Byron
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My point was that running the air conditioning costs a more than not running it. sometimes as much as several MPG.
Hi Floyd,

I was referring to what Byron said - guess I should have quoted him. Sorry!
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Old 09-28-2010, 07:16 PM   #33
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Hi: All...There's an old "Newfie" saying..."The faster I go the behinder I get". I think that applies to MPG and trailer tuggin'. 19.5 miles per. Canuck gal. towing an Escape 5.0 on the trip to Niagara Falls and back taint bad!!!
Alf S. North shore of Lake Erie
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Old 09-28-2010, 07:19 PM   #34
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20% of 25MPG is 5mpg.
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Old 09-28-2010, 07:44 PM   #35
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20% of 25MPG is 5mpg.
I believe if you read it correctly, it said in some vehicles, not all vehicles.
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Old 09-28-2010, 09:33 PM   #36
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It seems to me that best mileage occurs at the torque peak for your motor; whether this applies for towing, I'm not sure.
Peak torque on my car is at 4,400 RPMs... I can tell you for sure that I don't get great fuel economy in that RPM range.

Many people do not realize that there is a big difference between greatest thermion efficiency and greatest fuel efficiency. Thermal efficiency is getting the most work out of a given amount of fuel. Fuel efficiency is getting the most miles per gallon of fuel. You don't necessarily need a lot of horsepower at the wheels to keep rolling down the road. The engine might not be at its most efficient, but you can be using less fuel.
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Old 10-01-2010, 10:11 AM   #37
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20% of 25MPG is 5mpg.
When I read the whole article it repeated what I had said earlier. You're better off with the A/C than with windows open.
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Old 10-03-2010, 09:38 PM   #38
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mcbrew What are you towing with? I want one !! Lee and Norma
Sorry, missed your question until now. I tow with a Scion xD. It is a subcompact car made by Toyota which shares components with the Yaris, Corolla, and Matrix.

I just drove back from Gettysburg again today, but without the Scamp. I got home with 47 MPG in the display, which is more like 44 MPG in reality. I do calculate every tank at the pump. I won't end this tank with MPG that high... probably closer to 40 MPG once I get back into my normal commute.

So, 24 MPG towing a Scamp sounds good, but it is a LOT lower than what I usually get. My last tank was about 38 MPG, but that included some higher than normal highway speeds. My mileage really drops off above 60-65 MPH.
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Old 10-10-2010, 05:57 PM   #39
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I think something that has been missed in the aerodynamic issue in that your TV is punching through the air, your trailer is either also pushing through the air as well or slipping into the pocket that your TV creates. This all depends on the height and shape of the TV. Tie a piece of yarn to the rear roof section of your car and watch what it does while pulling your trailer and at what speeds, this will give an indication of what the air coming off the TV is doing and where it is going. With my forester the sweet spot to get the airflow to run off the roof and up over the trailer without rotating and getting caught up between the TV and the trailer is just north of 60, I can actually feel it when I get it in the "sweet spot".
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Old 10-10-2010, 07:07 PM   #40
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Hey, you are pulling a trailer.
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Old 10-10-2010, 07:12 PM   #41
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hey, you are pulling a trailer.
ok?
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Old 10-10-2010, 10:21 PM   #42
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Originally Posted by Byron Kinnaman View Post
When I read the whole article it repeated what I had said earlier. You're better off with the A/C than with windows open.
At low speeds, "windows down" has considerably less impact.

THAT ASIDE, What I said earlier did not even imply rolling the windows down.

Quote...
""Many TVs are designed to run the air conditioner in several settings, including those which involve "defrost". The air conditioner can adversely affect fuel econmomy, to varying degrees, If you don't need it on don't run it.""


I have a flip open air roof, which does an remarkable job of venting the cab on my truck while actually improving the fuel economy by a measurable amount when towing.

BTW; "Mythbusters" did a show on this issue and declared it "Busted"
They are probably as credible as most internet sources
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