LS1 goodies.

[Gary Derian]

Economy at cruise is greatly improved with really low engine rpm.  The V-8
GM cars run about 1300 rpm at 60 mph.  City economy will be lower because
consumption at idle is greater with a larger engine.  The PCMs keep mixture
at stochiometric to keep the cats working.  In the early 90's some ran lean
during cruise but this was considered a defeat device and was disallowed.
Your LS1s on the other hand may use a lean cruise.

Gary Derian <gderian at oh.verio.com>

> Hi all,
>
> Well now the LS1 is available in our 'family' cars here in Oz, I took some
> interest.
> Given the U.S folks have had these for a while now some of you may be able
> to fill me in on something that is puzzling me.
> Holden's stated Fuel Economy figures are not much worse than the 3800 of a
> few years back, how?. Are the PCM's running these LS1's a new generation?,
> do they run very lean at cruise?.
>
> Thanks
>
> Ross Myers