mild steel vs. chrome moly

Chrome moly 1 5/8 tube .083 wall weighs 1.3670 pounds per foot and mild steel at 1 5/8 tube .134 wall weighs 2.134 pounds per foot. On average a Chrome moly cage will cost 3 times the money( parts and labor) that a mild steel cage cost so for the few pounds of weight savings (around 40#s) spend the extra money on something to make the car go fast.