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Everything is pretty maintained, I think I will give the O2 Sensor a try.


I talked to the service manager at my Toyota dealer whom I've known for a long time and was advised that the mpg starts deteriorating around 70 - 80K miles due to the o2 sensor on the 3.4L V6.

My 4Runner (88k miles on it) has dropped about 3mpg above and beyond the winter gas deal, so I got one on order and will pick it up Monday..

You only need to replace the front one.. the one behind the cat (second o2 sensor) would not affect mpg.

2000 4Runner,V6,Auto,31's, Sliders, Skids, On-Board Air, Air Shocks
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