Results of installing a K&N Filter
On May 10 I installed a K&N filter in my '05 FEH. I have recorded before and after mileage as measured at the pump, and thought I would share it with you.
The short version is, before the filter I got 32.7 mpg over 1876 miles. After the filter I got 34.8 mpg over 2086 miles. Assuming I haven't made some funny error when running my numbers, replacing the paper filter with the K&N has given me an improvement of 2.1 mpg. The only source of error that I can think of is that it has been warming up. I purposely limited my sample window to limit this effect. My first tank before the filter was filled on 4/3/07, and the last tank after the filter was filled on 6/5/07. I haven't particularly noticed more power, but that's not why I tried this in the first place. Enjoy, salsbr The long version is this. Before filter: 415 miles, 13.219 gal, 31.4 mpg 424 miles, 13.117 gal, 32.3 mpg 395 miles, 11.747 gal, 33.6 mpg 339 miles, 9.853 gal, 34.4 mpg 303 miles, 9.399 gal, 32.2 mpg TOTALS 1876 miles, 57.335 gal, 32.7 mpg After filter: 154 miles, 4.298 gal, 35.8 mpg 259 miles, 7.264 gal, 35.6 mpg 400 miles, 12.485 gal, 32.0 mpg 291 miles, 8.728 gal, 33.3 mpg 490 miles, 13.925 gal, 35.2 mpg 492 miles, 13.187 gal, 37.3 mpg TOTALS 2086 miles, 59.887 gal, 34.8 mpg |
Re: Results of installing a K&N Filter
I noticed pretty much the same thing.
However, I have no way to prove if it was from switching from paper to K&N, or from switching from dirty to clean! ( I had 25k on the stock paper one ) I guess you could buy a clean paper one and see if your mileage drops. :P-John |
Re: Results of installing a K&N Filter
Originally Posted by gpsman1
(Post 128668)
I noticed pretty much the same thing.
However, I have no way to prove if it was from switching from paper to K&N, or from switching from dirty to clean! ( I had 25k on the stock paper one ) I guess you could buy a clean paper one and see if your mileage drops. :P-John But, good point. |
Re: Results of installing a K&N Filter
Oh, and one other thing. I have been exclusively using Shell gasoline.
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Re: Results of installing a K&N Filter
The car I traded in for the TCH last month jumped ~2 mpg when summer blend arrived.
Not sure which KN filter you're using but there've been reports of some of them passing much more contamination through to the engine, showing up as high silica readings in used oil analysis. |
Re: Results of installing a K&N Filter
I wonder why Ford engineering sacraficed 2 mpg for a restrictive air filter. Did thye recognize the 2 mpg change between the selected air filter and a less restrictive air filter?
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Re: Results of installing a K&N Filter
Originally Posted by DavidH
(Post 128749)
I wonder why Ford engineering sacraficed 2 mpg for a restrictive air filter. Did thye recognize the 2 mpg change between the selected air filter and a less restrictive air filter?
In their minds the risk/benefit/monetary equation comes out in favor of the paper filter they selected. |
Re: Results of installing a K&N Filter
Originally Posted by TeeSter
(Post 128777)
Automaufacturers don't like reusable air filters. They beleive if they are oiled incorrectly they could cause damage, they believe it allow more particulates into the engine, and it replaces a part they can make money on with replacements with one that lasts for the life of the vehicle.
In their minds the risk/benefit/monetary equation comes out in favor of the paper filter they selected. |
Re: Results of installing a K&N Filter
Did you know that the only time less restrictive airflow will be advantageous is at WOT and at or near the engine RPM for PEAK intake airflow. Otherwise the throttle butterfly valve is the primary restriction to intake airflow.
Sounds as if you go WOT and wrap that engine up to the top end fairly often. |
Re: Results of installing a K&N Filter
Originally Posted by DavidH
(Post 128779)
There are other types of high flow filters. The simplest way is to increase the filter media (paper) of the filter. More pleats or a larger filter!
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