One thing that surprised me is that when the article talks about "big cars", I had initially assumed they meant the ubiquitous family crossover SUVs (RAV4 / CRV and the like) that have more or less completely replaced the family sedans. However the curb weight of those vehicles is more or less the same as sedans (all hovering around 3K lbs). What they actually meant is essentially just heavy duty pickup trucks, which are closer to 5K lbs.