Is 80 pounds really that noticeable in a 2,800 pound car? If the gas tank holds 13.2 gallons and gasoline weighs 6.3 lbs/gallon, the difference between a full and empty tank (≈11.2 gallons) is about 70 pounds. Every time we fill our gas tank, we increase the car’s weight by about as much as the delta between the 1st and 2nd gen BRZ/86. I’m with @
chipmunk and suspect that 80lbs is nearly unnoticeable. As counter point, if that 80 lbs increased torsional rigidity by the claimed 50%, handling may improve despite the slight weight gain.