Fuel Econ and Hiway Mode

[Tedscj at aol.com]

In a message dated 10/11/00 8:30:20 AM Eastern Daylight Time, 
jgonyou at hotmail.com writes:

> Wouldn't the advantage from EGR come from an inert gas in the cylinder,
>  >thereby increasing the effective compression ratio at part throttle 
(filling
>  >up the cylinder with something other than precious fuel and still allowing
>  >the mixture to be close to stoichometric)?
>  
>  
>  It may be inert, but it's still compressible.  No help there.

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!)
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