Here’s a chart about cars, showing the changes since 1975 in some key dynamics about how cars use energy and how big they are. It’s from the EPA’s latest report on automotive trends, and it pegs these three variables at 1975 levels, charting the changes. Check it out: As you can see, there were big […]
Here are four more charts about the US car fleet over time. The first shows average vehicle weight, average horsepower, average fuel economy, and CO2 emissions. Particularly the weight trajectory reminds me of Jevon’s paradox, where increases in efficiency can lead to more energy use. Also, trucks are much less efficient than cars.