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Old 06-14-2012, 04:05 PM   #71
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Do front air dams improve MPG? Both my Rams came with an air dam. I've removed the one on my 97 CTD when I added tow hooks and never put the one back on my 94 1500 after some body work. I was thinking of putting one on my MH.
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Old 06-14-2012, 07:57 PM   #72
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If you really want better fuel mileage, forget about the wax and try to plan your trips only making right turns. Then you won't waste any time or fuel sitting in a left turn lane waiting on the light...
Jeff
Or check the weather , and only travel on days with a 40mph. tailwind.
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Old 06-14-2012, 08:29 PM   #73
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With my luck, it's always a head wind... both ways.
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Old 06-14-2012, 08:35 PM   #74
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I can't believe you worry about getting an extra .01 mpg by waxing but then go buy those big flat nose motorhomes. Thats like trying to pull a parachute through the wind.
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Old 06-15-2012, 01:00 AM   #75
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Well let's see, if you reduce the drag of the wind on the coach, in therory yes your MPG will increase. Now in the real world you should not be driving that fast, that long to see an actual MPG increse.
If you want better MPG then slow down to 53MPH and set the cruise control. You will se about a 3-5 MPG increse. IH yeah don't forget the wax
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Old 06-15-2012, 03:02 AM   #76
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OK, with as much time as I spend here I should know this, but.....

I've read many references made by members that keeping their coach waxed improves MPG. The problem is, every now and then some of our members are prone to offer "tongue in cheek advice" and I don't know whether or not to believe what I've read.

So... what say ye all. Does a good wax job have any impact on the MPG of a DP?

Thanks

Rick
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Old 06-15-2012, 07:54 AM   #77
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I think adding the air foil things would just be a problem to keep clean. More hassle than the fuel mileage gain not to mention I don know if I like the look.
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Old 06-15-2012, 09:11 AM   #78
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Maybe... But if you put the airfoils on, coat them with RMP#3 and hand wax each one, it will double the mileage gained by adding them.

Hey... Has anyone that has used RMP#3 on their oxidized MH noticed a MPG improvement?
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Old 06-15-2012, 10:36 AM   #79
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I can't believe you worry about getting an extra .01 mpg by waxing but then go buy those big flat nose motorhomes. Thats like trying to pull a parachute through the wind.
Nobody's worrying here mate. Just asking questions.

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If you want better MPG then slow down to 53MPH and set the cruise control. You will se about a 3-5 MPG increse. IH yeah don't forget the wax
If those are the results you see in your rig, it's very impressive. But, it would represent a 40% to 70% improvement in MPG in my rig and it just doesn't happen. I'm not even in 6th gear at those speeds so lose the benefit of overdrive.

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Old 06-15-2012, 10:57 AM   #80
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Do front air dams improve MPG? Both my Rams came with an air dam. I've removed the one on my 97 CTD when I added tow hooks and never put the one back on my 94 1500 after some body work. I was thinking of putting one on my MH.
Short answer is yes-and use the side skirts as well. This cuts down turbulence in the under carriage and creates a low pressure area under the RV which helps to hold it to the road. Trick is to get the air dam/side skirts as close to the ground as you can and to use rubbery material that will forgive the bumps it will have over time.
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Old 06-15-2012, 11:21 AM   #81
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Come on. It's simple. The shinier it is, the less air resistance and the better mileage. If you can't see your face in the shine, you're wasting fuel.
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Old 06-15-2012, 12:08 PM   #82
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The only way to increase MPG, other than slowing down, always driving with a tail wind and similar ideas, is to decrease drag on the MH. In order to do that, all exterior protrusions need to be removed...rear view mirrors, antennas, air conditioners, roof vents, sky lights, ladders, toilet/sink vents and anything else that sticks out and blocks air flow. Somebody give it a try and tell us how it worked.
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Old 06-15-2012, 12:25 PM   #83
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I Googled air dams and got mixed results.

Cat, I'll get right on that. When is Bonneville Speed Week?
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Old 06-15-2012, 01:48 PM   #84
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Well let's see, if you reduce the drag of the wind on the coach, in therory yes your MPG will increase. Now in the real world you should not be driving that fast, that long to see an actual MPG increse.
If you want better MPG then slow down to 53MPH and set the cruise control. You will se about a 3-5 MPG increse. IH yeah don't forget the wax

Bad theory (You should not be driving that fast) IN my younger days I could RUN fast enough to notice wind resistance... On foot, and I'm not even a fast runner.. Today I can still bicycle fast enough to notice wind resistance... I can, if I really work on it, hit around 20-25 mph on the bike. Given a slight tailwind.
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