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2005 Corolla
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33 Posts
Discussion Starter · #1 ·
I've noticed since Sept that my gas mileage has been getting worse. I drive down this big hill every day to work and during the summer when coasting down this hill (w/ foot off gas) I would actually pick up speed. For the last couple of months now coasting down this same hill, i actually start to slow down. Could the cold weather be having that much affect on my lube/bearings? Is something else going on here? I'm experiencing the same thing with my Tundra (although that beast never picked up speed going down hills).
 

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I don't hate C3H8
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763 Posts
Tire pressure and cold, weather. Dive around for a half hour or so then try it again you will see the difference.
 

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Bullitprooph
1986 MR-2 N/A, 1991 Celica GT-S, 2005 Matrix XR, 2009 Matrix XRS, 2009 Matrix Base
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1,504 Posts
Um, tire pressure shouldn't have THAT much affect on your downhill coasting. Up here in the Frozen North, it gets down to -20 (Celsius) regularly, and it's still not necessary to add air (down to -30 degrees, well that's another story). I've had the same problem in all three of my cars and it's either been: a) slightly or very seized caliper, or b) wheel bearing.

Considering costs, try the "adding air to the tires" approach first and hope for the best...;)
 
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