winter fuel consumption

[Brandon Rogers]

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/