[cb1]

I have a 2000 tl, 81,000 km.and I check my mileage on a regular basis. Shortly after change to new tires (same make and model as on the vehicle) and put in a K&N filter, my mileage has gone down some 20%. Car runs well, smooth idle, everything fine. Went back to original filter, no difference.

Any suggestions as to what might have happened (perhaps precipitated by the use of the K&N filter with increased air flow) or what I should check next.

My dealer had really no suggestion other than I might try changing the plugs.... there has been a few articles about increased air flow making some sensors not operate correctly ...is there any validity to this?

Any help appreciated.

Colin