Fuel Econ and Hiway Mode

[Jeremy Gonyou]

>I don't think he was implying that inert gasses aren't compressible,
>just that...more gas volume (but not more petrol) + same cylinder volume  =
>higher compression=better efficiency.   (of course, that's assuming all 
>other
>things being equal...which they never are!)

Are you thinking that the EGR is in addition to the regular charge via 
pressure or something?  EGR replaces an equal volume of charge.  I don't see 
any change in pressure.  I stand by my very-small-rocks theory.

Jeremy
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