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Did you weigh the new and old wheel/tire combo?
It'll be very hard to tell a 3 lb difference. I am sure I couldn't. But my suspicion is that in your case your new wheels/tires are more like 8-10 lbs heavier than the old ones.
When I went from 18" to 17" on my Boxster, I saved ~9lbs per corner. And yes, you can definitely feel that difference!
Hope this helps,
Gary
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