Unsprung weight v sprung weight.
isn't the rule of thumb that 1kg of unsprung weight is equal to about 2.5kg of sprung weight? Plus the rotational inertia that has to be overcome.
I can see your point though. I once spent an afternoon swiss-cheesing & deburring the panels on a Cortina a mate raced. Possibly I pulled 1 or 2 kilos out of the panels. The driver was a BFF and weighed about 140kg. No amount of panel drilling was going to offset the tub of lard in the drivers seat.
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