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For the umpteenth time...ZL1 tires are ligher than OE. Even at 285f and 305r. Check TireRack specs...or any specs...if you don't believe me.
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I haven't seen the new ZL1 tires on TireRack yet as GM will keep those off the list until the ZL1 is out. The SS's tires are 32lbs each (front) 36lbs each (rear), the 285's on TireRack weigh 29lbs with a 35 profile, that's not great but it is better than 32lbs. The 305's will be a 30 profile I believe so I can see that being 32lbs (Pirelli's 305's) with the extra width. That's 14lbs lighter than the SS's tire meaning only 8lbs were pulled from the wheels. I forgot that the quoted "22lbs" wasn't just the wheels, it included the tire weight as well. It would have been great if they could pulled that out of the wheels alone. Now it doesn't really seem like a weight saving measure, they just changed the tire and lowered the profile.
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With lower fuel economy, reducing the size of the tank to save 15 lbs would be ridiculous...
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A gallon of gas is roughly 8.34 pounds, so 25.02lb weight reduction with a 16 gallon tank. The GT and GT500 use a 16 gallon tank, use the tricks..
When the Z28 was being discussed, so was weight... I think once they started adding things on top of the basic SS, they soon realized that this thing was going to be a monster. Just with the engine and transmission alone puts this thing close to 4100lbs. Even the LS9 would only save about 20-30lbs... Now were talking a huge cast iron diff, "beefy" driveshaft, "beefy" halfshafts, exterior moldings, interior work, MRC and other improved suspension/sways. Adding all this up, we start pushing the 4200 mark. This is where the Wheel/tire combo comes in. The exhaust, which should be very similar to the SS's with the exception of the mufflers, manifolds and H or X pipe. I'm not 100% sure, but I think I have heard some folks going with aftermarket exhaust for a 35-45lb weight savings, won't pass emissions so I would say 15-25lbs is a good target area for exhaust.
This is only if there are no additional support braces under the car... Its only 20-30lbs but for handling... it has to be done....