zhenka

I took the advice of this board and installed a K & N air filter. It has been a week and i do not see any improvement whatsoever. Computer is still showing 20.9 mpg. Any suggestions?

thanks

HowieNJ

You can either reset ECU manually or wait til it resets itself. Use the search on the board to find out best way to do it. Is the 20.9 all highway mileage. How many miles have you driven in the week and what is the most you drove at one time?
If it is combined mileage then you are not doing bad at all

zhenka

thanks. I will look into this now.

HowieNJ

also, dont forget to hold the info button down and reset the trip computer.

zhenka

you know, i just bought this car recently and did not even open the manual yet. so i hope, what you are explaining is in the manual. otherwise, i am clueless. Likely i am getting a lot of useful info from this fine forum. Thanks

HowieNJ

unless you reset the trip computer, it will keep accumulating the numbers. If you have been getting 20 mpg for 3 months and all of a sudden you are getting 23 mpg for the last week. Its going to take a long time for your avg mpg to really change. Reset the trip computer(hold info button for a few seconds) each time you want an accurate reading of your mpg. If you are planning to run 200 miles on the highway one day, reset it and see what it reads for that particular trip. Otherwise. everything is combined mpg, city, hwy, suburb.

20.9 is pretty accurate for me too for my 60% hwy 40% suburban driving. But if i get up on the hwy and drive a couple hundred miles and reset it just as i get on the hwy, I will consistantly get 22.7 - 23.4mpg.
That includes slowing down every few miles on the garden state pkwy to go thru the EZ pass lanes

Hope this helps

ederny

If you are really interested in the possible improvement in MPG, some time in the next couple of months, try this. Set up a 20-30 mile run on the highway (there and back). Drive it once or twice, resetting the trip computer (Avg MPG) like Howie said each time. Do this all on the same day (weather conditions, traffic, speed, etc.). Then once you feel you are getting the expected reading, Avg MPG, replace the K&N with the old one you took out and do the same drive a couple more times resetting the Avg MPG each time. Let us know what you get with K&N and standard paper. Good Luck.

zhenka

ok, i am ashamed to say it but when i said that i am averaging 20.9, that was average trip. I looked at avg mpg and it was around 16.9. Now it is around 17.7. That is real city driving. Stop and go. This saturday i am driving to New York, so I will see how it behaves on the highway.

Ederny- can't use your advice. I threw out the old filter. thank though

Pilot

I read a report some time ago on another forum about an increase in dirt (parts per million) discovered during oil analysis after using K&N air filters. This was compared to many oil reports on a complete fleet of vehicles over a period of time before the K&N's was installed. The K&N's were chosen to save money on replacement filters, but were all later removed after the oil analysis was reviewed for all vehicles. Although K&N might meet OEM standards, IMO it is not worth the chance of more engine wear over the life of the vehicle. I prefer to stick to OEM air filters. There is no doubt that the K&N will flow better, but remember that airflow requirements are well known by auto engineers who design the size of the OEM filter in the first place. If more flow was needed, the engineers would simple design a larger filter surface. The aftermarket industry would want everyone to think that more flow will always be better. What do you do if the engine can't suck more air in the first place? Do you think that the auto engineers are ill informed and try to choke down the airflow in all engines when they design the car? The airbox and airflow in all new cars is computer designed to work perfectly.
Aftermarket filters are for the track or highly modified engines, not the street engines we all have.
If you want a long engine life, stick to OEM filters for both oil and air.

Pilot

gzkrutoy

Are you russian, beacause I believe I have the same name?
What model RX do you drive 300 or 330?

zhenka

Hey, privet,
yep, i am russian and i live in Chestnut Hill. what about you?

gzkrutoy

I got a '04 Rx330. What do you drive?

zhenka

RX300 year 2000. where are you located?

gzkrutoy

Swampscott on the North Shore.
Where are you from originally? How many years here?

zhenka

i am originally from Kiev, Viva Klichko!!! I have been in the USA for 8 years. i am 25, actually 26 in two weeks.