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I very very much doubt that you will gain anywhere near 20% range between ps4s and primacy. If you look at tirerack mpg tests, the spread is 3mpg at the 20's. I'd say maybe 5%. Is that worth it? Just drive th wheels and tires you have. The 19's might be a little more comfortable, but I also doubt it's worth switching down. Most of the stiffness is coming from the suspension, no?
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