On the 57, you could take off the hubcaps and lose 30 pounds. Either way, you wouldn’t notice it off the gross. :)
Actually, my Bel Air Sedan is 3200 lbs. The new top of line Camaro is 3,702 to 4,374 lbs. My 67 Camaro convertible is 3,200 stock and I will be able to drop its weight by 300 lbs.
What kills the gas mileage most is the transmissions. I want to swap to the 7004 4 speed which will get my cars up around 16 mpg.