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Old 02-13-2009, 06:01 PM   #1
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Default K7N Air FIlter vs MPG

OK guys, this may be just a fluke, but....

Last week I installed a K&N Air Filter on my 07 F-150 (5.4 w/3.55 axle, tow package) I filled up a few days later and today I calculated my MPG on the first tank of gas.

Whereas before I was getting 16.4 mpg on my daily commute my calculation says I got 19.48 on this tank. That's 3 mpg. That's outstanding. And that's just the filter, not the intake kit.
So now I'm thinking, is this a , or a , or a

I'll make a few more calculations over the next few weeks and let you know.
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Old 02-13-2009, 06:47 PM   #2
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I've been told they really work Wade. That's the same engine and rear end I had in my '99 F150. I miss my 150, it was a hoss of a truck and very nice. I'm told they make the same type kits for the diesel like I have now. I'm glad it's working for you. I may have to try it on the diesel. It also gave you a little more hp didn't it ?



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Old 02-13-2009, 08:18 PM   #3
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I tried one on my diesel, didn't change the MPG at all, seemed to have a bit more power. I am thinking about going to a Banks Intake with the ram air option.
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Old 02-14-2009, 08:54 PM   #4
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If you check the diesel Bulletin Boards, they are generally saying not to use a the K&N on a diesel. It passes more dirt and will kill a turbo. On the gasser, do not use too much oil on the media as it will kill you mass aair sensor.

Ken
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Old 02-15-2009, 11:59 AM   #5
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Ken...It was pre-oiled at the factory.
Jim...I dunno about horse power as I have no way to measure it.

I'm really looking forward to finishing up this tank of gas so I can do another calculation. I keep thinking of all the things that could go wrong to give me bad numbers, but all the errors I can think of would false with worse MPG, not better.
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Old 02-15-2009, 12:48 PM   #6
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Dad had one on his Ford D350 Diesel he uses to tow the 5er. He seems to have good luck with it -- He also had a Power Chip that he got for the engine computer that helped with MPG. I have read though on some of the Forums Mixed comments on the K&N Filter. Was thinking about getting one for my Gas MH (Workhorse) but decided to wait until I found out more. I know they have been around for several years (K&N) so would be surprised if they impacted warranties etc as others have said.

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Old 02-15-2009, 07:46 PM   #7
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The K&N is a part of the full Banks package I installed on my Triton V 10. The overall result was outstanding, but no appreciable increase in mileage.

Well satisfied with the combination.

Increase in HP was evident. Application of the chip and the tranny override were noticable.

I do follow the cleaning instructions to the letter.

73 Mac AE5FH
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Old 02-15-2009, 09:23 PM   #8
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Chatted with a mechanic shop owner today at church. He says people make 2 mistakes with K&N filters:

1. They fail to clean them, ever, reducing airflow to the point equal to worse than a dirty stock filter.
2. Using way to much oil.

Well, duh. The thing comes with instructions that need to be followed.
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Old 02-15-2009, 10:47 PM   #9
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Quote:
Originally Posted by Radio View Post
Ken...It was pre-oiled at the factory.
Jim...I dunno about horse power as I have no way to measure it.

I'm really looking forward to finishing up this tank of gas so I can do another calculation. I keep thinking of all the things that could go wrong to give me bad numbers, but all the errors I can think of would false with worse MPG, not better.
I was told by a friend (also F150 owner and Ford mechanic) that he could tell an appreciable difference in the trucks performance. That was my reference to more hp. He said he could tell a difference in the towing performance.

I don't think you could go wrong from the reports I've heard. Will be waiting for another report.

Jim



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Old 02-16-2009, 09:23 AM   #10
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Dont know about its source but I saw a refernce to this which is a so called "Independent" test of Air Filters -- Its on a Duramax Forum -- Gets to a point with some of the aftermarket stuff you just dont know what to believe. As I said, my Dad had one on his Ford and had good luck with it.
Here is the Link... http://www.duramax-diesel.com/spicer/index.htm

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