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Old 06-14-2015, 12:13 PM   #31
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Dan and Robert or anyone else with the Ecoboost, do you use premium when towing? I have not and haven't noticed any issues.
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Old 06-14-2015, 12:26 PM   #32
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Dan and Robert or anyone else with the Ecoboost, do you use premium when towing? I have not and haven't noticed any issues.
Ford says 87 Octane or higher, but they don't specifically recommend Premium. Around here, that's regular gas. On our trip north, especially in the Rocky Mountains, 87 was mid-grade or higher. I've never put anything in but 87, and it runs like a top. The variations in octane levels sold in certain states for Regular, Mid-grade and Premium vary quite a bit with altitude. Here it's up to 93. In some places they top out at 88 or 89.
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Old 06-14-2015, 12:45 PM   #33
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Dan and Robert or anyone else with the Ecoboost, do you use premium when towing? I have not and haven't noticed any issues.
I typically use regular, and use premium when towing. I beleive that is what is recommended, but now that you mention it, I cannot remember if I read that in the manual or not.
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Old 06-14-2015, 04:13 PM   #34
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Back to aerodynamics, take a look at this site: Aerodynamics 101 | ATDynamics – Fuel Efficiency Aerodynamics Technology for Tractor Trailers saving over 10% with TrailerTail and Side Skirts our Escape trailers are a miniature version of the tractor trailers and this gives us 'food for thought' on how we can improve handling and performance by smoothing out the airflow.


The contribution to fuel burn can be divided into five elements:




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Old 06-14-2015, 05:11 PM   #35
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Interesting. Reducing the low pressure in back of the trailer is as useful as manging high pressure in front. Still probably not practical for Escapes I suppose.
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Old 06-14-2015, 08:57 PM   #36
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Yes, there is potential in changing the trailer shape. I've seen a few attempts to make travel trailers in shapes that are more curved in various ways, but very few that look like there was any significant understanding of aerodynamics involved. One theme is creating a rounded end that is promising for the front, then using the same shape at the rear where it is a poor choice.

The Escape shape is a development of the classic Trillium 1300 and 4500 shape of the 1970's; the Escape models are enlarged but otherwise essentially unchanged in shape from those originals... except the 5.0 and 5.0TA which are a little different in front. I'm just guessing, but I don't think aerodynamics was the primary consideration in any of the designs. To me, the important changes are not the aerodynamics, but instead design features in floor and the much-improved joint between the top and bottom sections.

Although features such as a long tapered tail are impractical, some changes would be quite practical to build, but of course reasonable dimensions and proportions are still needed for a workable travel trailer.

The side skirts that have recently become common on transport trailers are not particularly applicable, since travel trailers (especially Escapes) are not box bodies perched entirely above the tires. On the other hand, the gap between the tug and trailer is more significant to us, and that's what a deflector on top of the tug would address.
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Old 06-14-2015, 09:29 PM   #37
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Oh just admit it, you stuck your foot it in Brian .
No, I meant what I said. We just disagree.

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No way the 390 in my Fastback will ever be "upgraded to modern materials," at least not while there's lead additives available. Even suggesting such a thing to a gearhead is blasphemy. If I said such a thing to my hodrod buds, they'd run me out of town on a rail...
I'm not talking about sticking some wimpy or inappropriate engine in - just a mod. Lots of gearheads and hot rodders fit appropiate exhaust valves and harder seats... but apparently not Donna's crowd. By the way, the additive may not be lead at all - there are lead substitutes for this purpose.

The only relevance of the lead-in-gasoline discussion is that it is an example of a changing situation (environmentally, technically, and legally) requiring a change in the fuel that is used. We may not agree with justification for these changes (I share some of Robert's concerns about ethanol), but will need to accomodate them. Ethanol is likely in your future...

Back to aero.
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Old 06-14-2015, 09:40 PM   #38
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Although features such as a long tapered tail are impractical, some changes would be quite practical to build, but of course reasonable dimensions and proportions are still needed for a workable travel trailer.
The Bonair Oxygen was one such trailer. It's totally cool! Too bad the company went bankrupt after building just a few.
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Old 06-14-2015, 10:35 PM   #39
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Originally Posted by Brian B-P View Post
I've seen a few attempts to make travel trailers in shapes that are more curved in various ways, but very few that look like there was any significant understanding of aerodynamics involved. One theme is creating a rounded end that is promising for the front, then using the same shape at the rear where it is a poor choice.
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The Bonair Oxygen was one such trailer. It's totally cool! Too bad the company went bankrupt after building just a few.
Yes, that's one that I had in mind.

For those not so familiar with the Oxygen (this is an Escape forum), I've attached the floorplan (from a 2002 Bonair brochure). The outline of the protruding tail lamp fairings is just visible on the tail end; ironically, it would probably be better aerodynamically if the whole body was that shape.

If anyone wants to try things on their Escape such as nosecones or tail fairings, just keep in mind that the considerations for each end are very different.
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File Type: jpg LR3165A.OXYGEN FLOORPLAN.jpg (11.8 KB, 26 views)
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Old 06-14-2015, 10:43 PM   #40
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I saw a used or demo Oxygen at the RV show where I looked at the Escape and a stickie.
Viewing it from outside, I guessed that it was quite weird inside to accommodate the lines, and narrow too.
Have to admit, I didn't bother looking inside.

Edit: appears that I saved myself a couple minutes from BP's floor plan.
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