winter fuel consumption
John Cody Forbes
cody at 5000tq.com
Tue Jan 25 19:09:34 PST 2011
MTBE, google to see if your area uses it.
Many parts of this country use MTBE during winter. MTBE is an oxygenate added to fuel which increases it's octane and supposedly decreases emissions. Your (possible) problem is that it's an oxygenate, which means that in effect it's basically oxygen taking up space in your fuel so that the car must inject a higher volume of liquid to be injecting the correct quantity of fuel.
The following is using made up numbers to illustrate my point. It's as if every gallon of liquid you have in your tank is only 9/10ths of a gallon of fuel with the rest of the volume taken up by MTBE.
-Cody (mobile)
On Jan 25, 2011, at 9:50 PM, 200q 20v <a200q20v at gmail.com> wrote:
> 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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