Quote:
Originally Posted by hxman
I bought another o2 sensor, a genuine NTK 23400 from ebay that had been listed at $140 for $100 - the seller accepted my best offer  and my gamble paid off. I installed that sensor about 5 months ago and I've been getting anywhere from 38 - 42 mpg ever since. In city mpg is more around 36-38 but mixed driving usually gets me about 40 mpg.
I drove only on the highway 60-65 mph the other day and got a sweet 45mpg. On the other hand, if had I driven 80mpg the whole time, I would get around 33-34mpg. What works for me is to keep the rpm around 2500 and keep a light and steady pressure on the gas pedal to stay in lean burn as much as possible.
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Congrats on getting it running satisfactory. There is still more potential in that car, at freeway cruise. It looks like you might not be in lean burn all that often on the freeway. Aeromods and tire pressure and such will help.