[Vwdiesel] gas milage decline

[Nate Wall]

Not only can winter fuel have an effect there are multiple other cold
weather/winter effects (I know, some of these may be minimal, but they add up)

1. Lower tire pressures (unless you "top off" the air) (increased rolling
resistance).
2. longer use of lights (loads the alternator a little more).
3. Slightly increased wind resistance (thicker air).
4. Increased average wind resistance (Its just plain windier in winter)
5. Engine takes longer to reach operating temperature (This is probally the
biggie)
6. Engine oil, gear lube and bearing grease stays thicker longer, and remains
thicker in operation.

I notice 48 - 50, measured, in summer and about 45 - 47 in winter.

--Nate


TexasTDI wrote:

> Using any fuel additives?  I use Stanadyne Performance formula, 4oz per 15
> gallons.
>
> Chris Thornton
> 1991 VW Jetta GL 2 Door 1.6D - 233k miles
> 2000 VW Golf GLS 1.9TDI 130hp/229ftlbs - 73k miles
> 1998 VW Passat GLS 1.8T -- FOR SALE
> Amsoil Synthetic Lubricants Dealer #1098500
> http://texastdi.com/6/ubb.x
>
> ----- Original Message -----
> From: "James Hansen" <jhsg at sk.sympatico.ca>
> To: <vwdiesel at vwfans.com>
> Sent: Thursday, November 14, 2002 5:46 PM
> Subject: RE: [Vwdiesel] gas milage decline
>
> > If it's cold where you live this should be average normal... you are
> getting
> > winter fuel now, which has less power, hence greater fuel usage.  If the
> > idle sounds good, starts are good,  chances are nothing drastic is wrong.
> > What year engine- is it time for a valve adjust (pre 85)?
> > -James
> >
> > > -----Original Message-----
> > > From: vwdiesel-admin at vwfans.com [mailto:vwdiesel-admin at vwfans.com]On
> > > Behalf Of Dave K
> > > Sent: Thursday, November 14, 2002 5:22 PM
> > > To: vwdiesel at vwfans.com
> > > Subject: [Vwdiesel] gas milage decline
> > >
> > >
> > > This is a multi-part message in MIME format.
> > > --
> > > [ Picked text/plain from multipart/alternative ]
> > > All,
> > >
> > > Been seeing a decline in gas milage.  This is a rebuilt motor
> > > first 2K miles I averaged almost 50mpg.  The last 2 tank fulls I
> > > have gone down to less than 40 mpg.  Same route to work.  What
> > > should I start checking?
> > >
> > > Thanks,
> > >
> > > Dave Kysar
> > > --
> > >
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