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Originally Posted by hayaku
to add, 10lbs of weight loss = 1hp regained in unsprung weight (which wheels and tires are). your heavier rims and even heavier tires have added quite a bit of unsprung weight.
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FYI...I did a rough weighing on the wheels and tires a while back. The difference between the OEM 17" and the OEM 19" are roughly 10 to 12 pounds each (60lb vs 70lb front/72lb rear). So...just going from 17" to 19" will add about 44lb of unsprung weight. I could only imagine that the 20" will weight an additional 5lb or so more on each wheel...and possible more if you go with the replicas.
BTW, I am seeing about 14mpg city and 22mpg highway on the 19s.