Kobalt Tools 500 was Kobalt Tools 1000, The Reason, Tires

Not only did Toyota win their first race the race Sucked! To use a racing term.
The reason is simple read these quotes via USAToday:

Tony Stewart

"I'm going home and taking everything that has Goodyears off and put Firestones on and feel a lot safer," Stewart said. "It's a shame these teams that work so hard are being dictated by a company incapable of building tires fit for a street car."

"If they can't do any better than that, they ought to just pull out," he said. "I guarantee Hoosier or Firestone or somebody could do a lot better job."

Dale Earnhardt Jr

"I ain't going to put up with this," Earnhardt said. "I don't think any other drivers (are). ... We couldn't run side-by-side. We'd wreck. We had to let each other go by. Every time you got beside a guy, you were just like, 'Take it.' I couldn't go in the corner side by side. No one else out there really could, either."

Source: Nate Ryan USAToday