Cold making my Audi (95 90q) very fuel thirsty

[Bob]

My guess is that your motor is always trying to keep stoich. The cold
air is much more dense than on a summer day so each cylinder is being
filled with denser air, therefore more fuel too.


Joel A. Frahm wrote:

>*This message was transferred with a trial version of CommuniGate(tm) Pro*
>I make a long road trip for Christmas every year, and even in the days
>before RFG we noticed a large drop in MPG as temeratures got colder.  In
>the below zero cold it was very easy to see the drop in mileage.
>Generally we were driving closed-loop fuel injected cars of one sort or
>another.  I suppose it was a combination of increased air resistance,
>increased electrical load, and I suppose the engine might be operating
>in a less than ideal enviornment.  Maybe something like poor fuel
>vaporisation is the big problem.
>
>RFG does cause a drop in mileage, but I believe it is around 5%.  If you
>take 10% of your gas and replace it with a fuel that has half the energy,
>you lose 5% of your total energy per unit volume.
>
>-Joel.
>--
>Joel Frahm <frahm at jila.colorado.edu>
>University of Colorado, JILA
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