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Old 06-23-2017, 08:08 PM   #20 (permalink)
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Join Date: Jun 2008
Location: Somewhere in WI
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Silver - '10 Chevy Cobalt XFE
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Originally Posted by cRiPpLe_rOoStEr View Post
It's quite surprising to me. Narrower tyres putting more pressure to the pavement would be supposed to improve traction, and they're also lighter even though sometimes the weight difference might sound negligible.
Narrower tires on my cobalt increased FE and speedo was under 1% off.

While larger tires could have lower RR most are heavier to support a larger vehicle which drives higher RR

Add to this they drive higher CDa which may outweigh aero differences.
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