General tuning question - fuel economy

[Craig Marcho]

> Ya, but you'll get best econpmy at what 92 MPH?.
> Hahahaha
> 50% OD, gad zooks
> Grumpy

My dad's '98 LS1 Z28 would get 30mpg at 70mph all the time in 6th. All that
and low 13's at the drags! That kind of mileage was normal for him, too, he
put 58,000 miles on that car during the 14 months he owned it. (He travels
alot for work)

Craig M.

> > I have 87 Vet, 89 code, man trans.  I have done extensive
> tuning with hwy
> > fuel and spark.  I have ended up running zero hwy spark.  I
> suffered from
> > trace detonation with any hwy spark.  I have 11.1 to 1
> compression though
> so
> > your experience may vary.  89 code supports hwy fuel. I tried command as
> > lean as 16.0 to 1 and suffered from lean misfire, I am currently running
> > 15.5 to 1 at light load areas.  3.45 gears, 30% od in 4th, 23
> mpg (US GAL)
> > at 70 -75 mph.  AC on.  HOT LT4 cam, headers supperram.
> > I just installed  a ZF 6 speed with 50% od in 6th and expect
> fuel econ to
> > improve slightly in 6th once I get a few bugs worked out.
> > Mark
> > ----- Original Message -----
> > From: <JTesta1966 at aol.com>
> > To: <gmecm at diy-efi.org>
> > Sent: Tuesday, June 13, 2000 12:15 PM
> > Subject: Re: General tuning question - fuel economy
> >
> >
> > > In a message dated 6/13/00 3:10:46 PM Eastern Daylight Time,
> > > smarteney at xlvision.com writes:
> > >
> > > << e the O2 sensor, hence gas mileage goes down.  How do I compensate,
> or
> > >  can I?  I noticed there are some Hiway mode parameters, such as Hiway
> > spark
> > >  add (?), in the 165 ECM that I could take advantage of.  Or, is the
> only
> > way
> > >  to get better mileage mean changing the target AFR? >>
> > >
> > > In my GN, I run 16.2:1 Hiway mode AF ratio and in the lower load
> sections
> > of
> > > hiwat Mode Spark Advance, I added 4* timing. Added 3-5mpg on the
> highway,
> > > depending who of my friends you ask
> > >
> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > Jim 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
> >
> >
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