its also because theres more addatives in the gas during the winter.
its normal.

my mistake i meant addatives rather than alcohol.

 

Higher density cold air also requires more energy to push through. Not to mention everything has a little more friction when it's cold. Be sure to check your tires too.

The 35psi recommendation is when the tire is cold on a 70 degree or so day. In the winter, the stock nonworking psi should be 2-5 psi higher depending on how cold it is. I know when it was 90 degrees out, if my tires were at 35psi sitting, they would be at 41-42psi warmed up. When it's 10 degrees out, if it's at 35 psi, they'll only be at 36-37 psi warmed up.

 

Well I average about 24-26 MPG from my house to work and this is combined highway/local mileage.