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I was wondering that as well.
Mike, on a typical highway trip, do you mostly drive with load (DWL) , or employ pulse & glide (P&G)?
If your existing numbers are DWL, the lean burn will make a significant difference. But I'm guessing from your initial 5 mpg boost and comment about the time delay for lean burn to kick back in after engine off that you're more of a P&G driver.
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