I saved a little weight due to a tire shop screwing up. Last time I replaced my tires, the shop was breaking down the front ones on a filthy, muddy rug.
I noticed after they were installed, the mud had scratched the plastic coating on the aluminum wheels. Showed them to the owner and we both found out the coating can not easily or cheaply be fixed.
The owner agreed to replace the wheels at no charge. I asked if I could have the old scratched wheels to install on the inside drive axle. Don't know if everyone knows, but the inside drive wheels are steel. He agreed to install them at no charge. So now I have 8 aluminum wheels instead of six. Don't know how much weight I saved.