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07-29-2014, 07:18 PM
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#2 |
 ULTIMATE
Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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The tire width (i.e. reduced friction) would be the thing that would help with fuel economy (minimally {1-2 MPGs max} between 175 and 185). The 175s would rotate 3.3% more than the 185s, so your speedometer would be off by that much between the two.
I believe that 14" setups are typically a bit lighter than 15" setups, so you would notice a bit better acceleration (as well as the smaller diameter would also help this, but would reduce your top end / would mean higher RPMs for same vehicle speed).
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