The Honda Accord, Then and Now (and Now)
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.
Source:
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