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depending on how much hwy driving you do, going up one size on your next tire purchas
e will help lower the rpms at cruise.
ex: 2002 Infiniti Q45 Sport 340hp V8
stock 245/45/18
I run 245 50/18 on factory rims.
Picked up about 7% reduction in rpms.
But I do alot of freeway and It more than paid off.
(see my threads)
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