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Just looking at weight difference of tire and wheel. Looks like factory Sport wheel is 31.6 lbs and aftermarket wheel in 18" is 22 lbs. Factory tire size generally p235/40R19 is 23 lbs. Tire rack list 18" as p225/45R18 and that is 1/2" short. The best size is a p235/45R18 which ways roughly 25 lbs.
So you save 8 lbs per tire/wheel in 18".
So you save 8 lbs per tire/wheel in 18".