I was going to say "and how light we could make a car", but then i actually looked up some stats, and this was news to me: http://web.mit.edu/sloan-auto-lab/re

I was going to say "and how light we could make a car", but then i actually looked up some stats, and this was news to me: http://web.mit.edu/sloan-auto-lab/research/beforeh2/files/MacKenzie%20Zoepf%20Heywood%20Car%20Weight%20Trends%20-%20IJVD.pdf http://web.mit.edu/sloan-auto-lab/research/beforeh2/files/Ma... Car weight declined sharply from 1976 to 1982, then started creeping up again, but cars in 2010 were only about as heavy as cars in ~1979.