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+1 Bruce and about the O2 sensor if its not throwing a code i wouldn't bother changing it out. The PreCat sensor will affect your mpg's but they are sensitive and if not throwing a code it should be fine.
And just remember your gains might be small now, but as you continue to drive the same route while hypermiling the more gains you will see over time.
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"The only real mistake is the one from which we learn nothing."
- Henry Ford
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