How much will adding 16 lb to my car affect ET/mph(rotating weight)

So i found a sight that said that 1 gram of rotating weight was equal to 2 grams of chassis weight.
this was a dirt bike forum so if that theory holds true on a car. That means that my addition of 16 pound X 2 is 32 lbs
a tenth (.010) take 100 pounds..........So 32 pound would equal ruffly .003 of et..........Fishmens67 you, and most every on else may be right and it just don't matter.

I thought that it would have had a bigger impact.

Come on all you Mathematicians show us a formula :)