There aren't enough Tyrannosaurus threads on TFP.
Tyrannasaurs were scavengers, mostly due to their size. While this meant that their main source of food was scaring other predators away from their victims, it also meant a lot of snacking between finding carcasses. Maybe we should look at Jurassic Park as it's probably the best example.
1) The electrified fence loses power and the T. Rex wonders out after having a snack (goat). It's probably still pretty damned hungry. It sees the Jeeps, which I'm sure it was transported in after birth to get from the hatchery to the area of the compound it would be housed in, so it likely is aware that there are creatures in the Jeeps. It investigates and suddenly sees a bipedal mammal run into the bathroom and it follows, out of instinct and because it's hungry. It eats the lawyer and is still hungry, but it realizes that there are small and edible creatures in the Jeeps.
2) The T. Rex encounters Sattler, Malcolm and Muldoon in an open Jeep and pursues, but only for about a minute because it realizes that despite the delicious a la cart meal's easy accessibility due to the open top, it's exhausting keeping up with a vehicle that can drive hundreds of miles at a time... and it breaks off the chase quickly.
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