Fuel Econ and Hiway Mode

[Guenther, Max [ASCO/PA]]

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)?  

Max

PS. Buick had EGR at least as far back as 73.  

> Your right, for as far as you go, but like I was trying to say not
> everything is a universal law.
> 
> You also, have to look at what was going on at the time, 74 ish was the
> peak
> of the oil shortage, and the politics of gas were running the entire show,
> so a devise that generated cleaner air, and better mileage was of Biblical
> proportions.  What also happened for the first time was the introduction
> of
> unleaded, and the crap additives they used just trying to get the stuff to
> run.  i do think it was 76  when GM first used EGRs, and man there was all
> kinds of $illy $hit going on.  Things were  SOOO bad that Vegas were
> selling
> like no tomorrow.
> Bruce
> 
> >
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > Jim  (FA) Testa                                             TType86 on
> > #BuickGN
> > ASE Master Technician
> buick.fiendish.net:6667
> > L1 Advanced Engine Performance                    NJ Lic MV Inspector
> > jtesta1966 at aol.com                           NJ Lic Emission Repair Tech
> > http://members.aol.com/jtesta1966/buick.htm
> > Associate Sponsor, Buicks at Bristol (RCA/JTP)
> >
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