Not sure how cold it is where you are, but that's pretty typical. There are a lot of factors that reduce economy in cold weather:
- cold engine
- cold transmission and differentials
- higher air density increasing aero drag
- higher air density increasing engine pumping losses.
- spinning on slick surfaces, or slow traffic on slick surfaces
A block heater helps quite a lot for shorter trips. Grill blocks will help a bit too.
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