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So first things first I did the necessary things to get the xterra rubbing right again and replaced some sensors that have a major affect on the fuel economy. First I replaced the old o2 sensors with some new ngk o2 sensors. Replaced the mass airflow sensor, did the ignition timing, switched out the mechanical fan with the electric fan, took off the a/c. All of this was pretty good to do but didn't make a huge difference in fuel economy. I was probably starting to get 14-15 mpg highway at the time.
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