C63newdude

I almost purchased a set of BMC filters, I was also tempted to buy the VDC filters but ultimately I decided to order K&N. Within the last month I put over 2000 miles on HWY miles (long trips).

I first did a 600 mile round trip to Gran Canyon AZ and got a mid 22 MPG with stock air filters but I just drove 875 miles one way on interstate HWY and got over 24MPG at mid 70mph. I think my gas mileage is approximately 1.5-2mpg better. Also, keep in mind that my car was fully loaded with cargo and people and a good portion of the trip I drove on altitude (between 3000 and 4000 feet) and with the A/C on the entire time.

Definately not feeling a huge increase of power but certainily a better fuel economy. For those of you that want something simple and affordable I think the K&N are worth the money. I ordered mine from Autozone and got them within 48hours (special order), cost me like $110.

Last but not least, when I ordered my K&N I order the 2008 year because the 2009' year wasn't listed. Good luck!

Unbreakable1

sounds good...thanks for the information

Sincity

Did you remove the charcoals as well?

XtinaNoel

i dont even think my car ever hit that high mpg i get like 6 - 9 sometimes 12 on highway lol

Jae Duk

Whoa vast improvement. Most I've seen on mine were 21.1 and that was 80mph all the way
Just out of curiosity did you see any improvement on local?

C63newdude

Yes indeed.

C63newdude

The 24.1mpg I saw it after an average of 72mph(maintained for a few hundreds miles) and I saw 23.7mpg @78mph average (after a few hundred miles).

This is not my imagination folks!, I pay a lot of attention to the gas mileage information in all my cars, I normally reset my trip odometer and on board computer everytime I put gas on the car. I am positive I am getting at least a solid 1.5mpg better. I am driving back this week so I am doing the 875 miles trip again in 4 days, I will document the gas mileage and share the results again.

mac911

So many factors go into MPG, just a bit of a warning to everyone on that as I've built myself up and been let down on this before.

I will say though that you also can't discount stock filters being dirty and hampering mileage and or performance.

Interestingly, I've read that a dirty filter will actually hurt performance more than mileage per gallon as the computer compensates.

Amazon usually has pretty good deals on K&Ns and Green Filters.

I have a lot of dust around my home and the roads by it, so I tend to stick with the stock than risk anymore dirt than already getting in, but I do replace them regularly and notice performance returning when I do (at least my brain believes I do).

gsrjc

Which one might be better KBC green filters or K&N?

M-bENZ

just bought a set of K&N for my clk. I say go with K&N.

Andy

C63newdude

I am almost certain that there might be other better filters out there but honestly I rolled the dice on the K&N filters because even if you go wrong you don't lose a lot of money. I figured it would be worth for the gas mileage, the power increase and for allowing you to clean them instead of having to pay for paper filters.

I live in the desert and the filters always get a lot of fine dust. To me it is a small price to pay considering what you get back..

mac911

On another forum I read, people really like the Greens. They claim they are a bit less oily amongst other things.

On Amazon, they are pretty cheap too, but the sell out a lot cause they are so cheap.

mthis

i have 3 sets of filters at home.
1.my stock.
2.my k&n's and
3.the green vrp ones.

you know what i got on my car?????? BMC BABY all the way.

gsrjc

I have the VRP ones now but i think after 1.5 years of driving they might be a little dirty so looking to get a new set.

C63newdude

Why not stop on Autozone and buy a cleaning kit?, it cost like $9.95 and you can clean your filter. It would save you big money.

peh-amg

Slightly off topic but I did a 230 mile trip yesterday which was 98% highway and I cruised at approx. 72 mph and got 22.0 mpg. I was happy with that. My C63 is stock with charcoals removed.

PatSC23

does the K&N make any difference in sound? Might be a really stupid question but I thought I read in some other cars it does.

gsrjc

good idea. you think the so-called performance is similar to a brand new one?

danielemccabe

dude, i took out the charcoals, replaced the stock with k and n's and today, i got 10.9 mpg on a few short local drives. maybe you don't nail it with the regularity that i do, but with all this power, how could i be expected to lay off??? did a 0-60 run today in under 4 seconds - did the racetimer to boot! hiyoooooooooo!

danielemccabe

you know what, tomorrow, i'mgoing to drive her easy, and see if i can get 17mpg. but that sound, that wonderful glorious sound from under the hood.....what is that? it calls to be driven hard,. hiyooooooooooooo!

gsrjc

I can't even get more than about 225 miles in city driving and some highway driving before i need to fill up the car... oh well, i wouldn't trade it though.

Ron Scarboro

I routinely get 21.7 to 22 on the computer only to calculate 19-19.5 when I actually refill. Just drove from NC to PA today mostly on I85 and I95 at 70-75mph. I got 338 miles before refilling with 17.689 gal which makes 19.1mpg, computer said 21.8. If I had gotten 24.5 mpg that would have made 433 miles to that tank.

24.5 full of people and luggage in a C63? Only if down hill the whole way and pushed the last 17 miles. ;-)

C63newdude

Well, it has been about 2 months since I did the Service A and removed the K&N filters and I can confirm one more time that the K&N filters will yield at solid 1.5 if not 2 MPG extra.

If you read the begining of the post I reported an improvement of gas mileage after installing my K&N filters. After the Service A I had to remove them because according to the service advisor the K&N filters was the cause of my lean codes on my ECU.
I did not argued with the Service advisor and I removed the filters. Now with the stock filters the gas mileage sucks big time.

You don't need to do the testing, just read my posts, I did back to back testings, before, after and reverse and definately the K&N will yiled the extra 1.5-2 mpg.

sunil517

The first tank was 15.8 excited and see what she had after that was 75-80 all the way home where in NJ I saw 24.3 I still think it is less ...just too good to be true..stock filters... I am goign to check white pen and paper for the next long trip in 2 week the ECU never seem to be correct as pen and paper...

I am Jeff

I honestly don't know how u guys do it. I live in NYC and I routinely get 9-12 miles per gallon. If I get 19 miles per gallon on the highway I'm giddy and dElighted. Am I doing something wrong? I'm missing 5-6 miles per gallon compared to u guys. Lol