Quote:
Originally Posted by Steve Di.
I traded in my truck for a Jetta TDI (diesel). I love the car and appreciate its 50+ MPG economy on the highway.
I have noticed my fuel economy drops by approximately 10% during the winter. I realize that fuel economy in the winter is affected by weather and temperature, but I believe the refineries are adding something to the fuel that contributes to the drop in economy.
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It's a change in the fuel mixture, colder temps usually provide better milage, all other things being constant.