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Originally Posted by PackerlandPrius
Over the last month I've noticed a 10 mpg decline. I was getting around 54mpg now I'm getting 43mpg. I have an 05 Prius and I just hit 30,000 when it started to go down.
I live in Wisconsin and it has been getting colder but it seems like a large decline.
Has anyone else noticed this? Is this common during winter months or is this something I should have checked out? . . .
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Yes:
There are two mitigation strategies:
(1) block heater - ICE and possibly transaxle pan heater
(2) route planning - increase the low-speed part of the initial commute by trying to stay below 30
mph for at least 1-2 miles
GOOD LUCK!
Bob Wilson