Do you guys think its good to replace my stock OEM air filters with the same or to get something different like K&N...my car has sucked on gas mileage (get about 280 miles a tank...all highway driving) so i figured i'd start to figure out whats going on by changing these..any other suggestions will help too (i love my car but its getting expensive filling up like every 3 days.) Thanks guys

 

"get about 280 miles a tank...all highway driving"

Have you had it into a shop for diagnostics? I doubt the air filters are the root of this problem. You should get over 400 miles per tank. A +30% loss is more than simply the air filters.

 

When your engine is able to breathe better it's always a good idea. Unless your current air filter is totally plugged up I doubt if you'll see much improvement in gas mileage. How many miles on your G? You might whata drop by Nissan and have them run a check....Gary

 

shes got about close to 98000 miles..i'll drop by the nissan dealer this weekend to get it checked out.

 

Speaking of engine air filter, i just stick to OEM (replacement) instead of K&N. I just don't think the risk of over oiling the filter (from factory or after you clean it) is worth the additional 1hp (if there's any).

just my $0.02, YMMV

 

There is, and its well documented. Plus the fact that its reusable so you can theoretically use one filter for the life of the car, as opposed to buying new paper filters and throwing the old ones away

 

stick with OEM filters, and look elsewhere for fuel efficiency issues.

 

I just replaced my Air filter's with the *Two drop in K&N's and there is a small *Good difference, you won't see a big gain but you will know that you won't have to buy another air filter for the Life of your car and if you are that nervous about cleaning and re-oiling them *Youtube is your friend or go to a local shop after an oil change they will more than likely do it for *Free.

$0.02...

 

You're probably due for some new plugs.

 

is the car stock or modified?

 

all stock

 

then my brother, you've got a problem.

 

O geez

 

You know, just stating "280 miles per tankful" isn't nearly as helpful as calculating the actual mpg you are getting. Is your gas gauge just off? or has the actual gasoline consumption gone way up?? The only way to tell for sure is to know how many miles you drove during a given period and divide it by how much gas was delivered through the pump handle. Referring to tankfuls doesn't account for issues like inability to fill the tank completely, fuel level sender or gauge failure, etc.

.02

 

If ur all highway and getting 280 something isn't right..

Dirty air filters make a lot of difference... but not a 120+ mile difference. I usually notice about am additional 50 extra miles on a fill up. That being said, k&n personally scares me cause of the chance of over oiling.

Mass Air Flow sensor maybe a culprit, or there's a very low chance the sensor in the has tank could be incorrectly reading gas content?

Do u always get the same 280 or is this a recent trend?