Has anyone else experienced worse gas mileage during the winter months?

 

Yes...

Gas stations use a winter mix of gas starting in October/November. It's easier to ignite at colder temperatures (I believe) but is not as efficient as the blends used in summer.

Also, people tend to let their cars warm up more often which obviously burns more fuel.

 

You are also using the heat and defrost almost constantly. The defrost uses the ac compressor to take the moisture out of the air. AND in my case I tend to spin my tires alot and do slides etc. in the slippery conditions.

 

In the summer I used to average close to 400 miles/tank of gas. The past month or so it has dropped to 330-340 depending on how much city/hwy driving is done.

 

that explains a lot shoot well cant change it floor it

 

I know I get really bad gas mileage in the winter. Winter = Performance mods and cold air = I drive harder and faster for some reason. Car feels like a totally different beast in the winter with my modifications

 

Yep, I've been noticing allot worse gas mileage since its been cold. Theres probably multiple factors for why that is.

 

I know what you mean there. I had a 400hp Camaro not counting the nitrous. Only bad thing about the cool weather was the cold roads and no traction. lol