[f5fstop]

Colder weather will bring a drop in fuel mileage. So, hopefully, your mileage will go back up when the weather turns warmer. My city driving dropped from around 14.5 to around 13-13.5 last winter and this winter, but after last winter it went back up. Takes too long for the engine to warm up, thus the fuel stays a bit richer for a longer period of time.

I should also note that this summer when traveling to Utah, I noticed a one to two mile difference in fuel mileage from heading west to heading east. Heading west usually means heading into the wind, and that cut my mileage, while heading east increased my mileage.