I think you are all missing the point. He had a relative question for someone who is learning. Weight reduction - as all things - are variable and can have a dramatic effect on a vehicle when done properly. Removing the tire (40lbs or under) is a step in the right direction - instead of saying 'your stupid don't do that' perhaps the proper response would be 'that is a part of it - keep going'. If you remove a bunch of small things - the weight quickly adds up and you'd be surprised at how much you can shed.
Sound deadening in the trunk and rear, back seat, windshield washer reservoir, lighter battery, passenger seat, sunroof, ac compressor, hood, lighter rims, etc - can all be removed (going a bit overboard but proving a point) - apart its not a big deal but together you just lost some serious weight.
I don't know the exact number but figure roughly 100 lbs -.1 off quarter mile you could shave .2 or .3 if not more off. Just food for thought.
David Hall - 2009 Pontiac G6 GT Blue 4-Door
Performance: CRABS 03 and FPU, Resonator Delete, RL Strut Tower Bar
Appearance: Debadged - Window Tint 35% front 18% back - Emblem Overlays - Door Sill Overlays