Agreed, it's hard to follow the graphic. It's in constant motion so you really have no time to compare or anything. One thing I did notice is that you have all current cars on the slide whether they existed or not in a particular time frame, like the Viper is present in 1965 and has a low HP number. It kinda looks like it's a running average. Then, in the mid 70s, the Mustang and Cobra are rated way higher than they were in those days, which kinda supports the thought that those are running averages in my mind.