I live inthe panhandle of texas and now that the weather has turned cooler my mpg has seemed to go down. CAn anyone explain this?

 

All engines are air density sensitive.
Injesting more air due to the lower temperatures requires more fuel to attain the same air/fuel ratios.
The cold starting is always on the rich side and gets even richer during colder temps as well as being in that state for a longer time until the engine thermostat begins to open.
Just a fact of life.

 

Its normal.

I dont even get 300 miles to a tank now :\