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Old 02-06-2012, 08:58 AM
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timfitz63 timfitz63 is offline
MT = Doppler Shifting
Location: Lorena & San Antonio, TX
 
Join Date: Aug 2010
Posts: 869
Mein Auto: 2007 X3 (MT)
Quote:
Originally Posted by Evlengr View Post
... I still think whatever they treat the gas with during cold months and the temp itself eats about 1-3 mpg, but that could also be the added heater and ac/defog adjustments.
Those things certainly all contribute. As well as the fuel mixture, which remains richer for a longer period of time after start-up (until the engine reaches operating temperature). It just takes a bit longer to warm everything up during the winter months...

I generally get ~18 mpg in pure city driving; ~22 mpg in mixed; and 25-27 mpg on the highway.
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X3 w/6-speed & Sport Package:
A sports sedan disguised as an SUV...
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