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Old 07-11-2015, 05:52 PM   #1 (permalink)
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Clean vs Dirty Car / Much difference?

Hi, everyone!

Recently got 54.62mpg on a 746 roundtrip drive from Oakland to LA with a dirty car.

How much better would my MPG improve with a clean car?

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Old 07-11-2015, 07:22 PM   #2 (permalink)
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in Gran Turismo you get +2MPH top speed!
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Old 07-11-2015, 08:03 PM   #3 (permalink)
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How much would your MPG improve...???

Zero... Zip... Nada...

>
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Old 07-11-2015, 08:10 PM   #4 (permalink)
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in Gran Turismo you get +2MPH top speed!
Hmmm. Can you play Gran Turismo to practice your hypermiling skills?
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Old 07-11-2015, 11:50 PM   #5 (permalink)
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I have wondered if there is a difference in fuel economy between a well waxed (slippery surface) car and a dirty car. I would presume there to be a difference but real life aerodynamics sometimes doesn't do as one would think.
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Old 07-12-2015, 12:44 AM   #6 (permalink)
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Quote:
Originally Posted by ThePrudentNinja View Post
I have wondered if there is a difference in fuel economy between a well waxed (slippery surface) car and a dirty car. I would presume there to be a difference but real life aerodynamics sometimes doesn't do as one would think.
According to Gary Eaker, who runs the A2 wind tunnel, no:

"Wax: Contrary to what you may read on your favorite message board, well-waxed, smooth paint is no more aerodynamic than the worst spray-can, flat-black primer job you can imagine."
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Old 07-12-2015, 01:50 AM   #7 (permalink)
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"You painted that yourself?"
"You can tell?"
"Only because it looks absolutely atrocious."
"It is just as aerodynamic as a professional paint job!"
"Just as... aerodynamic? All that you cared about was it being aerodynamic?"
"Hey, it will not rust, either!"
"It would look better if it did!"
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Old 07-12-2015, 07:59 AM   #8 (permalink)
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I generally keep my cars clean and waxed, unless like the Sentra, the paint job was trashed. There is so much wax on the Mirage, rain actually cleans the outside. Rain-X on all exterior windows keeps them as well as rendering the windshield wipers virtually useless.

Better mileage?

Probably not.

regards
mech
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Old 07-12-2015, 11:56 AM   #9 (permalink)
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Aircraft benefit from flush-headed rivets, as seen in the movie Aviator, but they operate in laminar flow. Cars are in a turbulent flow at ground level.

Gloss paint and wax addressed limitations in the material. Modern paints can be impermeable and still have a satin or flat finish.

I watched a Youtube video on car detailing, where they suggested Carnuba wax on the glass instead of Rain-X. Thoughts?
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Old 07-12-2015, 03:45 PM   #10 (permalink)
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Back in my automotive detailing days in 1984 we put the same wax on the windows and chrome as we did the rest of the paint.

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