I don't know, Man, T-Rex has a hidden Advantage, Air sacs. Air sacs are used for breathing, they assure that oxygen rich air, flows continually, when breathing, in and out, it's very similar to that of birds. It's suggests that T. Rex needed to eat a whole Buffalo, every week to keep going. Plus, Considering the average T. rex clocked in at about .44 kilometers per hour fasterthan the average human, there's still a pretty good chance it could outrun whatever it wants to eat. But then again, 7-9 Tons is a lot of Weight, requiring a Full 2 Seconds, to make a 45 Degree turn, So I guess Ambush Makes more sense, But I'm not dismissing the idea, that T-Rex COuld still give ya a good run...