Tow Speed - Page 2 - Fiberglass RV


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Old 09-27-2010, 01:03 PM   #15
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Originally Posted by Tezha View Post
Is there a speed that gives the best MPG or does it depend on the TV.
I wondered the same thing. To find out, I bought a Scanguage II. (No association; about $150.). It connects to your OBD2 port under the dash on all cars 1995 and newer (just a straight plug in). It shows four data items at a time, which can be changed, including current MPG and average MPG. You can switch between reading for the trip, tank, today and yesterday.
Basically, the slower you go, the better the MPG. I have a manual transmission and I wondered if it's better to downshift and when; downshifting burns more gas.
When on the interstate, I try to stay around 55 if I'm not holding up traffic. If I'm planning a long trip, I use a spreadsheet I made to determine what my costs will be a various average speeds to help me decide if the extra time it will take me is worth the savings.
Good luck!
Barrie
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Old 09-27-2010, 02:40 PM   #16
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My Subaru tells me what my gas milage is currently and on average for a trip, how far to the go to next gas up etc. Its intreasting to watch it change. There is no saying what the sweet point is - all depends on where you are driving. :-) On an average trip on the coast I average on a trip about 23 MPG.

The worse gas milage I have ever seen the car dash display was towing on a hill in the Cascades with a serious head wind - was only doing about 40 and the gas milage read 7 mpg! Thankfully things did not stay that way for long.
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Old 09-27-2010, 05:51 PM   #17
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I have found that my Tachometer is the 1st gauge to follow for maximizing mpg, and my Speedometer is a modifier for road conditions. I try to keep it at 1500 rpm's or lower, and really get amazing fuel economy at 1000 rpm's.
1000 rpm seems really low to me, but then I suppose each vehicle is different. Below about 2000, my car would be seriously lugging with a load. That is, I could certainly still drive, but it would be hard on the engine. I try to keep my rpm up over 2000, especially if I'm "asking" anything of the engine.

I guess it's something to check for your own vehicle.

Raya

PS: "Remember when" moment: Remember when gas mileage first became a big deal, and they sold cars (manual transmission) with an "upshift" light for best gas mileage? Only they had you shifting at such low rpm that you got great mileage but it was terribly hard on your engine (poor "enginage")
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Old 09-27-2010, 06:39 PM   #18
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I have an instant MPG and tank MPG display on my dash. I have noticed that under a good load (towing up a hill, for instance), that I sometimes get better fuel economy by downshifting to 4th gear. The RPMs are a bit higher, but I guess it puts the engine into a more efficient part of the torque band.
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Old 09-27-2010, 11:42 PM   #19
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At 70mph with a AWD Town and Country minivan, I get 11.5 mpg. 70 is definitely not the sweet spot!
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Old 09-28-2010, 06:57 AM   #20
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To add to my previous post: I got about 23-24 MPG towing our 13' Scamp up 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!
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Old 09-28-2010, 07:53 AM   #21
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I tow at 90 Kmh (54-ish Mph) as much for the view and pace as the mileage. If the trailer is on behind, it's time to put yourself in a vacation frame of mind and enjoy the scenery.
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Old 09-28-2010, 10:23 AM   #22
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Quote:
Originally Posted by Raya L. View Post
1000 rpm seems really low to me, but then I suppose each vehicle is different. I guess it's something to check for your own vehicle.
I must admit 1000 rpm is a very rare occurrence, only when going slightly downhill or on the flat when the engine is just maintaining momentum. I once noticed it while crossing the low desert on a long trip. The next gas stop indicated 18 mpg for that segment, the highest I ever experienced while towing.

Much more common for me is in the 1500 to 2500 range, with a 15.9 mpg average.
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Old 09-28-2010, 10:27 AM   #23
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Quote:
Originally Posted by Cam A View Post
I tow at 90 Kmh (54-ish Mph) as much for the view and pace as the mileage. If the trailer is on behind, it's time to put yourself in a vacation frame of mind and enjoy the scenery.
I wholeheartedly agree with that.
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Old 09-28-2010, 10:58 AM   #24
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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.
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Old 09-28-2010, 12:39 PM   #25
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Originally Posted by Barrie Bochoff View Post
I wondered the same thing. To find out, I bought a Scanguage II. (No association; about $150.). It connects to your OBD2 port under the dash on all cars 1995 and newer (just a straight plug in). It shows four data items at a time, which can be changed, including current MPG and average MPG. You can switch between reading for the trip, tank, today and yesterday.
Basically, the slower you go, the better the MPG. I have a manual transmission and I wondered if it's better to downshift and when; downshifting burns more gas.
When on the interstate, I try to stay around 55 if I'm not holding up traffic. If I'm planning a long trip, I use a spreadsheet I made to determine what my costs will be a various average speeds to help me decide if the extra time it will take me is worth the savings.
Good luck!
Barrie
Heck, we only use "speadsheets" at night when the rig is not moving at all! [also have good stabilizers]
25O thread count is usually more economical, but 600 thread count is worth the difference!
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Old 09-28-2010, 02:59 PM   #26
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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.

Preemptively....<_<
Yes, I have heard the data on rolled down windows and air conditioning.

Frederick;
Another guage which used to be common and installed for watching fuel consumption is the Vacuum guage.
The thing worked pretty well, but it was distracting, tedious and annoying when used properly.{lol}

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.

Also the way you drive has a big effect.

Byron
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Old 09-28-2010, 03:16 PM   #27
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Old 09-28-2010, 04:40 PM   #28
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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.
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.
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