Re: Fuel Usage When Idling

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?