Cold weather equals more power

[j.fro]

+1 "my mileage has gone down from 25-26 to 22-23 MPG"
My MPGs always drop in the winter, just like this.

[Porsche9]

I've seen a similar drop in mileage. I attribute that to the car that longer to warmup and thereby using more fuel during that this period. With my cars I generally see the best mileage when the mornings are warm and the afternoon is not hot enough requiring AC. Once the AC is on and it get real hot mileage drops.

[Jager]

The EPA use to mandate minimum proportion of oxygenates be added to automotive gasoline on regional and seasonal basis… Is that still going-on? This was done to reduce pollution during the winter months. I always noticed improved performance but mileage declined.

[BYprodriver]

Originally Posted by Jager

The EPA use to mandate minimum proportion of oxygenates be added to automotive gasoline on regional and seasonal basis… Is that still going-on? This was done to reduce pollution during the winter months. I always noticed improved performance but mileage declined.

Oh yeah especially here in CA