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If you're only driving 8 miles one way you probably aren't even getting out of closed loop mode
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that could be, but my s10 is open loop for less than a minute
before I am off my block it is closed loop - but it does run rich for 1-2 miles after that
I think to light the cat - but who knows
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i think 33-40mpg is pretty good regardless.
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this is an excellent point (and encouraging)
when you get up there in MPG little things mean a lot
(one trip thru the drive thru at McDonnell's can really set you back
)