How to predict MPG? - Page 2 - Fiberglass RV


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Old 05-04-2011, 08:09 AM   #15
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Name: Kevin K
Trailer: 17' Casita
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Mike Magee
What speed are you driving?
I drive 60 MPH. I get 16 MPG when towing with a 99 Silverado 2 wheel drive auto 4.8 V8, 20 MPG no towing.
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Old 05-04-2011, 09:20 AM   #16
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Name: Jesse
Trailer: 1984 Scamp 13'
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When towing gas MPG will be about 20% less than your avg MPG.
Not me... I get about 38 MPG not towing and 24 MPG towing. That's about a 37% drop. A lot of it depends on the vehicle, the trailer, driving style, and terrain. In my experience, gasoline engines tend to lose more MPGs than diesels.
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Old 05-04-2011, 10:58 AM   #17
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Name: Norm and Ginny
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Florida
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The Honda CRV loses 18% (23/28) when towing a Scamp 16.

Norm
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Old 05-04-2011, 07:36 PM   #18
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Name: Michael
Trailer: Li'l Hauley
Oklahoma
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Mike Magee
What speed are you driving?
I drive 60 MPH. I get 16 MPG when towing with a 99 Silverado 2 wheel drive auto 4.8 V8, 20 MPG no towing.
At 62-65 MPH, 10.5 to 11 mpg. towing the cargo trailer. Or
at 57-60 MPH, 11.5 to 12 mpg.
Not towing and going 70 MPH, 23-24 mpg.

My other vehicle is a Mercury Mountaineer 5L V8, gets 18 mpg highway but towing the same trailer, it gets about 11 mpg at 60 MPH.

I had a Windstar van with V6, 22 mpg highway but only 10-11 mpg towing a similar trailer. Pretty uniform results among the three, which makes me shake my head in wonder at a vehicle that only loses 20% when towing. All of mine would lose about 50%.
[edit] If I can get a more aerodynamic cargo trailer (either a custom job or a Lil Hauly are the most attractive possibilities right now), I think I would get about 15, maybe 16 mpg with my Highlander. That is a 1/3 reduction versus non-towing. Still a long way from 20% though.
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Old 05-05-2011, 06:01 PM   #19
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Name: Norm and Ginny
Trailer: Scamp 16
Florida
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Mike G.

I don't know how to explain the CRV's performance but it's reality.

We typically get 28 mpg highway driving at 65 mph when not towing.

We typically get 23 mpg highway driving at 55-57 mph when towing.

Here are the details of our rig and approach to trailering:

In both cases we are mostly in our highest gear, 5th. We do have a manual transmission and I always keep the RPM above 2000, usually between 2000 and 3000 rpm.

We typically do not run the tow vehicle air conditioner, primarily because we do little warm weather traveling. When we travel in the summer we are usually heading north.

I also boost the pressure of the Honda's tires well above normal (24-26) with the rears at 39 and the fronts at 32. I suspect that helps a little. I believe stiffening the rear tires helps support the tongue and potential side forces.

We are not rapid accelerators. On our trip home from Florida this spring we only passed two vehicles.

The Honda now has 140,000 miles on it. The only service we perform are fluid changes, filter changes and brake pad replacements. Actually it has the original plugs, they probably should be replaced.

We are also great waxers, keeping both the tow vehicle and trailer waxed.

We also have no roof protrusions, like Max vents or roof air conditioners, reducing the frontal area a little. As well we do not have an awning on the Scamp.

Our RVs are usually among the lightest in their class after packing. We do not carry stuff unless we plan to use it. (This is a change from our Motorhome days where the underneath storage is greater than the volume of a Scamp. We're presently emptying the Bounder getting it ready to sell. When we started RVing in the Bounder we thought we had really down sized. The Scamp is another level of downsizing, even from our former Sunline.)

Even though we're gone for months at a time, we keep it light.

I know nothing about your cargo trailer but I will say the Scamp and Casita were 15% better than the boxy Sunline (20 mpg) we used to tow. The bottom line is shape, frontal area and speed.

I hope this all helps.

Norm
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