This actually relates to my Fiat punto everyday car I use for work, but the principal is the same I guess.
Car has only done 10k miles from new but I have noticed a reduction in the fuel economy on the average MPG on my trip computer. Car is boked in for a service next friday so no biggie.
Anyway I wanderd if this reduction could be contributed to :
A) Colder weather recently (thought the ECU would adapt to this)
B) Does need serviced, new plugs etc...
C) Different Fuel, even though i fill up at the same garage every time
D) Maybe i've just been thrashng it for the last 2k miles and haven't noticed...

No big deal, i just wandered what your thoughts were, as I'm bored @ work

 

That's easy:

colder weather:

- Car needs longer to warm-up, -> cold start fuel enrichment is active much longer
- excessive use of electrical driven gadgets makes the alternator work harder (heated rear window, heater fan, etc.)

 

Ok, thanks for that, now I have to think of something else to keep from getting bored again!

 

Why my Ford Focus 1.6 is quicker than most other Focus 1.6's low down, yet my top speed is considerably less than theres. IE, It gets there quicker but mine stops at 110, I have been in one that has done 125.

 

How far to work?
If short distance cold would have a greater affect overall.

 

Absoluty!

 

Never use rear screen demister, draws a shitload of power.