Nifty series of charts showing the remarkable evolution of the Honda Accord over time. In twenty years its weight has increased by more than 50%, while its horsepower has gone up by a factor of 2.5. For practical purposes, it is a different car, and it has arguably been at least three different cars over time.
Knittel, Christopher R. (2009) Automobiles on Steroids: Product Attribute Trade-Off s and Technological Progress in the Automobile Sector. Institute of Transportation Studies, University of California, Davis, Research Report UCD-ITS-RR-09-16