T-rex and Speed

I've been doing some research to see if Tyrannosaurus rex can run quickly. First of all, the size of T-rex does not affect how fast it could run. I watched a few videos of charging elephants and they were hitting speeds well over 15-20 miles per hour. Obviously just because something is really large, does not mean it can't run fast. While I was visiting Baltimore, I made sure to see what the legs of Tyrannosaurus were like. While not the longest legs compared to body size, they were long nonetheless and very powerful. I don't think T-rex was the speedy killer like in Jurassic Park, but it was not a lumbering behemoth either. All in all, here's how I break down the speed of T-rex. It's size would affect it's speed to a degree, but not by much... 7-8 ton T-rex- 20-25 miles per hour 9-10 ton T-rex- 15-20 miles per hour 11+ ton T-rex- 10-15 miles per hour With a top speed of 25 miles per hour, Tyrannosaurus was certainly not the fastest carnivore out there, but for something that weighs over 7 tons, it was quite fast. [img]http://www.freewebs.com/dilopho_dd/tyrannosaurus_stan.jpg[/img]