winter fuel consumption

[Huw Powell]

On 1/26/2011 10:15 PM, Ed Kellock wrote:
> 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.

Indeed.

 > 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...

WTF?

> 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/