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K&N Drop in Air Filter

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Old Jun 4, 2008 | 03:08 PM
  #16  
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Joeb427
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Originally Posted by EJC
The measurements are by the cars computer - avg not instantaneous.
Yes I've modified my driving habits, but I did that well before the filters were installed.

On the '02 ES300 - the best highway mpg I had ever seen was 28 (avg), more normally 26.5 (Avg). After the K&N was dropped in I hit 31.5mpg (avg).

My Kids '06 SantaFe popped from 18 to 22 highway after the filter was installed.

The SC420 I seem to be able to keep around 20mpg combined highway/local now, used to drop to 16.5 combined, it does more around town because of the wife.

The IS250awd is now doing 26mpg, from 24mpg, I think i can gooose it higher with driving technique. It's hard to hold the car back.

For the hell of it, I spoke with a contact I have Lexus corporate today and passed it along. Let their engineers verify or disprove it. If it holds true, I just saved them a whole bunch of R&D $$$$$.
Believe me,it's more the difference in driving habits than a air filter.
Lexus and every other auto manufacturer are aware of the MPG and performance claims of a K&N,Tornado and every other so called performance and MPG gain item.
Still the paper air filters in vehicles.The auto engineers must not know what they're doing.
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Old Jun 4, 2008 | 03:09 PM
  #17  
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Originally Posted by EJC
The measurements are by the cars computer - avg not instantaneous.
Yes I've modified my driving habits, but I did that well before the filters were installed.

On the '02 ES300 - the best highway mpg I had ever seen was 28 (avg), more normally 26.5 (Avg). After the K&N was dropped in I hit 31.5mpg (avg).

My Kids '06 SantaFe popped from 18 to 22 highway after the filter was installed.

The SC420 I seem to be able to keep around 20mpg combined highway/local now, used to drop to 16.5 combined, it does more around town because of the wife.

The IS250awd is now doing 26mpg, from 24mpg, I think i can gooose it higher with driving technique. It's hard to hold the car back.

For the hell of it, I spoke with a contact I have Lexus corporate today and passed it along. Let their engineers verify or disprove it. If it holds true, I just saved them a whole bunch of R&D $$$$$.
They won't waste their engineer's time with it. It doesn't filter to the original spec (has been proven over and over again) and the increases you are seeing are not related to the filter (also proven over and over again). Sorry, BTDT too many times to count, and there are no significant increases from filter swaps. I bought my first K&N almost 30 years ago, so it's not like I haven't tried, they've just never delivered the claims.
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Old Jun 5, 2008 | 07:22 AM
  #18  
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Originally Posted by caymandive
Less air = less fuel thrown into combustion which equals slower car/increased fuel mileage.
Warm air and warm fuel mixes better, which gives a more efficient burn. It has nothing to do with reduced air density or the car being slower.
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Old Jun 5, 2008 | 07:28 AM
  #19  
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Originally Posted by Gernby
Warm air and warm fuel mixes better, which gives a more efficient burn. It has nothing to do with reduced air density or the car being slower.
I guess what I mean is that warmer air holds less O2 molecules so the car requires less fuel with the more efficient burn. The trade off is less power.
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