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First, you don't want to use a tire with a lower load carrying capacity - and depending on where you are, the laws may forbid it.
Besides, larger tires give better fuel economy - all other things being equal.
So that leaves the 185's out.
Further, the difference between makes and models of tires is much, much more important than tire size. Put another way, changing tire sizes yields only single digit improvements in RR, where change make and model of tire might give you double digits.
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