winter fuel consumption

[Ed Kellock]

It makes sense to me too, Brandon.  I think there is some digging going on
that exceeds the reasonable... I mean, winter running is going to be less
efficient than than warm weather, no matter what you do.  Lots and lots of
variables could be and are changing, whether it is different tires,
lubricant viscosity relative to temperature, gas formulation, etc.  This
discussion could easily go the way of Al Gore trying to capitalize on the
short-term statistical, however slight, upward trend of "observed" global
temperatures...

Ed
 


-----Original Message-----
From: 200q20v-bounces at audifans.com [mailto:200q20v-bounces at audifans.com] On
Behalf Of Brandon Rogers
Sent: Wednesday, January 26, 2011 1:54 PM
To: audi at humanspeakers.com
Cc: '200q 20v'; quattro at audifans.com; 200q20v at audifans.com
Subject: RE: winter fuel consumption


I agree colder/denser air does not affect efficiency, but because the air is
more dense you have to use more fuel to keep the mixture correct - hence
these motors making more power (more fuel and more air) at a given rpm
compared to summer (warmer temps).  That's what makes sense to me anyway.

Brandon  
 


-----Original Message-----
From: Huw Powell [mailto:audi at humanspeakers.com] 
Sent: Wednesday, January 26, 2011 1:21 PM
To: Brandon Rogers
Cc: '200q 20v'; 200q20v at audifans.com; quattro at audifans.com
Subject: Re: winter fuel consumption




On 1/26/2011 11:59 AM, Brandon Rogers wrote:
> I think also, colder, denser air requires more fuel to keep the proper
> mixture.

But that doesn't affect efficiency, it just makes a higher fuel/air 
charge possible if the engine management can handle it.

> Snow tires affect mileage.  More stop n go during snow storms.

Yup.

> Extra idle time to warm up.  I know I sure like the extra power in
> cold temps so my right foot gets happy too.

And that too.

Also, no-one mentioned spinning tires, which can happen by accident, or, 
um, on purpose.  Although, theoretically, that would still turn the 
odometer...

>
> Brandon
>
>
>
> -----Original Message-----
> From: 200q20v-bounces at audifans.com
> [mailto:200q20v-bounces at audifans.com] On Behalf Of 200q 20v
> Sent: Tuesday, January 25, 2011 7:51 PM
> To: 200q20v at audifans.com
> Cc: quattro at audifans.com
> Subject: winter fuel consumption
>
>
> Every winter my 200 becomes a gas guzzler. With the coldest winter on
> my ownership on record (global warming?) it has been the worst. It is 
> approaching consumption of a 4.2 V8  in city driving. There is no loss 
> of power, fuel smell, unusual exhaust, etc. VAG-COM data appears to be 
> withing recommended limits.
>
> The only observation is that when engine is cold simultaneous clutch
> disengagement/gas release while driving with no acceleration (2nd or 
> 3rd
> gear) on a horizontal road results in noticeable RPM increase for a
fraction
> of a second. If accelerating it is even more noticeable.
>
> Has anyone seen/solved anything like this?
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-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/


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