Two new cars every 10 years could mean 10 or so new cars over the lifetime for two people after they enter the work force. So that seems to be assuming about $90,000 per car over having it for 10 years (including insurance and maintenance). Presumably, they are looking at “average” new cars (about $49,000 these days) rather than less expensive ones (the cheapest new car in the US is about $20,000).