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Old 03-28-2012, 10:23 AM   #1
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Does fuel mileage suffer with mud flap?

I am getting things ready to tow a vehicle behind our recently-purchased Class A. After a lot of research I have decided to install the Ultra Guard mud flap from Camping World on the rear of the MH, and a DIY version of the Protect-a-Tow under the towbars. I read somewhere that others had experienced a drop in fuel mileage from the large mud flap. Have any of you had that problem? Thanks for your advice!
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Old 03-28-2012, 10:38 AM   #2
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I wouldn’t worry about the mud flap! Everything affects fuel mileage, Toad, wind, frontal area. But the biggest contributor is the position of the driver’s right foot!
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Old 03-29-2012, 10:48 AM   #3
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You're pushing a "barn door" down the road with something weighing 15 tons while pulling another 2 tons, don't worry about a flap...
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Old 03-29-2012, 11:02 AM   #4
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Any air flow restriction will create a drag but for the simple protection of the toad I don't worry about anything like that. JMHO
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Old 03-29-2012, 01:08 PM   #5
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I'd have to see some pretty convincing information to prove mud flaps would reduce fuel mileage in any measurable way.

It would be like saying you are closer to the moon when you stand on a ladder. Technically you are closer. Howsome ever.......
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Old 03-29-2012, 03:50 PM   #6
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Originally Posted by Arch Hoagland View Post
I'd have to see some pretty convincing information to prove mud flaps would reduce fuel mileage in any measurable way.

It would be like saying you are closer to the moon when you stand on a ladder. Technically you are closer. Howsome ever.......
Excellent response. I totally agree!
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Old 03-29-2012, 06:03 PM   #7
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Fuel mileage on most of these rigs is horrible anyway. I just try not to think about it. 8 to 10 MPG, not much difference.
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Old 04-03-2012, 09:26 AM   #8
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NAH

Quote:
Originally Posted by MSHappyCampers View Post
I am getting things ready to tow a vehicle behind our recently-purchased Class A. After a lot of research I have decided to install the Ultra Guard mud flap from Camping World on the rear of the MH, and a DIY version of the Protect-a-Tow under the towbars. I read somewhere that others had experienced a drop in fuel mileage from the large mud flap. Have any of you had that problem? Thanks for your advice!
Don't think you'll have equipment offering sufficient precision to measure the change in mileage.
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Old 04-03-2012, 09:30 PM   #9
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It may improve the down force one the rear axle for better handling in the corners. Add a front air damn to compensate. JK... I dont think it will make any more impact than sticking your arm out the window.

It is worth the investment to protect your toad.
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Old 04-03-2012, 11:11 PM   #10
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Quote:
Originally Posted by MSHappyCampers View Post
I am getting things ready to tow a vehicle behind our recently-purchased Class A. After a lot of research I have decided to install the Ultra Guard mud flap from Camping World on the rear of the MH, and a DIY version of the Protect-a-Tow under the towbars. I read somewhere that others had experienced a drop in fuel mileage from the large mud flap. Have any of you had that problem? Thanks for your advice!
Joe, I've narrowed my fuel mileage down to 7mpg to 8.5mpg, depending on the day and how fast I drive. If I drove at 50mph all day, I'm sure I'd do better. But I like to run at 63mph, so that's what I get.

Then we started towing a Honda Pilot. It made no difference in power or fuel mileage. Not that I can tell.

I don't think the mud flap has any appreciable affect on fuel mileage.

We use the Protect-A-Tow. I think you'll really like it.

When you install the mud flap, make sure it is at least 4" above the ground.
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Old 04-04-2012, 08:35 AM   #11
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An air dam on the front of the vehicle creates a low pressure area under the front of the vehicle and cleans up the parasitic drag from much of the front suspension gear. I have one of those on my rig.

The mud flap located on the back of the rig downstream in the air flow will have negligible effect on aerodynamics of a large Class 6 self propelled RV.
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Old 04-04-2012, 09:12 AM   #12
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Not to highjack this thread but:

Quote:
Originally Posted by Wizard View Post
Fuel mileage on most of these rigs is horrible anyway. I just try not to think about it. 8 to 10 MPG, not much difference.
Although it is a mere 2 mpg ... That's still a 20% difference!! We're about to make a 10,000 mile trip this summer, that 2 mpg WILL be the difference of over $1000 in fuel cost!!
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Old 04-04-2012, 09:23 AM   #13
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Originally Posted by Back-to-Doo View Post
Although it is a mere 2 mpg ... That's still a 20% difference!! We're about to make a 10,000 mile trip this summer, that 2 mpg WILL be the difference of over $1000 in fuel cost!!
2 MPGs is a significant number over thousands of miles. In regard to this thread, a mud flap would have to be the size of a drogue chute to impact the mpg to the tune of -2MPGs.
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Old 04-04-2012, 09:24 AM   #14
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I'll go out on a limb (not really) and say there is not a single RV'er out there that has the equipment and the controlled conditions capable of measuring any change in mudflap fuel mileage.
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