Recently there was an article about ****fting into neutral at stoplights
saving gas. I tried it but not enough yet to go through a tank of gas in
my
Astro. I did notice that the oil pressure dropped in neutral indicating
that the rpm dropped. To me that would equate to less fuel being pumped in
in neutral
"BigIronRam" <not@[EMAIL PROTECTED]
> wrote in message
news:KSO9k.158350$qk1.77563@[EMAIL PROTECTED]
>
> "David" wrote in message
news:urkc64puscjf1rgd8qmiqg8n1jjtg7un06@[EMAIL PROTECTED]
> > On Fri, 27 Jun 2008 10:32:11 -0700, PerfectReign
> > <theperfectreign@[EMAIL PROTECTED]
> wrote:
> >
> >>David turned on the Etch-A-Sketch and wrote:
> >>
> >>
> >>>>Your 6.0 Vortec will use slightly less fuel at idle than your 6.6 L
> >>>>Duramax, obviously.
> >>>
> >>> You've never seen someone drive two vehicles at once? Its
astounding!
> >>
> >>Need to watch bullit again...
> >>
> >>
> >>>
> >>> I know the Duramax has a larger displacement, but I thought the
> >>> Duramax would have less fuel usage at idle because its a diesel &
the
> >>> Vortec is a gas engine. The Duramax does get nearly twice the
> >>> miles/gallon that the Vortec does under similar conditions when
being
> >>> driven.
> >>
> >>
> >>Having done a ton of research on diesels - and wanting a duramax (or
even
> >>the future mini-duramax 4.5L) in my Avalanche - I know that the
difference
> >>comes from a few factors. (I'm seriously considering buying a used
> >>Mercedes 300d or 300sd for commuting purposes.)
> >>
> >>First, diesel fuel has more energy per volume than does gas. (At least
it
> >>did before ULSD fuel.) Therefore you need less of it to create the
same
> >>amount of torque to push your cylinders up and down.
> >>
> >>Second, because the torque curve is lower, you need less RPMs to move
the
> >>vehicle forward than you would with gas.
> >>
> >>However, at idle, I don't know if there is any difference.
> >
> > I have not noticed a significant drop in mpg since ULSD fuel appeared
> > on the market.
> >
> > I don't know for sure what idle fuel usage is. I have heard rumors
> > that Class 8 trucks (big over the road rigs) will burn a couple of
> > gallons idling overnight. I have no idea if this is true or not.
> >
> > The original reason for my post was to find out if there are any
> > reasearch studies, surveys, etc. that do***ent idling fuel usage. This
> > information might come from the feds, from vehicle manufacturers,
> > private individuals, etc.
> >
> > I would like to know if anyone has any verifiable idling uysage info
> > or knows where I might find it?
>
> I have ***mins and have had a Cat. The small "B" series (5.9l) ***mins
and
> the Cat 3126 (7.2l) each used around 3 gallons per night of idling,
> confirmed by evening and morning fillups. Diesels idle at about an 80:1
> air/fuel ratio. Gas engines 12:1? I did idle a 350 Chevy van overnight
and
> noticed the gauge dropped from 1/4 tank to below empty, never tried that
> again.
>
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