I had my X since Mar. '02 and have been tracking the mileage since. It is a '02 4x4 SE.

My X has 21,233 miles and total MPG of 14.57.

Before I put in a drop in K&N the MPG was 14.05 with 4,402 miles. Since then the total miles are 17,036 and getting a total MPG of 14.70.

I finally went to Mobil 1 in June and since then I have driven 2,869.7 miles and the MPG for that is 14.93.

Mostly a 20 mile each way commute to Miami. Hope this helps.