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Thank you for your warm greeting Daox. Matrix is also used by wife who does not practice hypermiling - yet. Average combined FE over last few months about 32 mpg. I have one question, whether you have any thoughts: The FE <using scan quage> I get with matrix once warmed up.... is depedent on what the idling rpm is - best mileage occurring when car idles around 800 rpm - but this is completely variable.. i can sometimes drive the car for over half hour and when stopped idling....it can still sometimes be at just over 1000 rpm... and when this is the case.. subsequent overall FE drops. Wonder if this is normal quirk or perhaps problem with O2 sensor.. . any thoughts ?
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