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Old 07-01-2012, 02:03 PM   #1
bobjenkins's Avatar
Join Date: May 2010
Posts: 3,646
Spare tire on roof rack gas mileage?

Hey guys does the spare tire mounted on a roof rack affect gas mileage much?

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Old 07-03-2012, 02:26 PM   #2
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Join Date: May 2010
Location: East Lansing, MI
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Yes, some, especially at highway speed. I'd suspect it woudl be the same 1-2mpg as you'd get with a roof rack sans tire.

That said, I'd be more concerned with it impacting center of gravity and the questionable strength of the tire mount in the case of a collision, however.
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