NASCAR Power Rankings: Top 20 Drivers Coming out of Texas

The NASCAR Sprint Cup Series leaves Texas Motor Speedway after an unusually quiet race.  There were only two cautions for debris. After the cautions, the cars ran a record 234 green-flag laps to finish out the race.While Jimmie Johnson led a race-high 156 laps, he couldn't hold off a hard-charging Greg Biffle for the win.This race showed how mistakes on pit road can be costly and how even top drivers can struggle just to keep up.Let's take a look at the power rankings after the Samsung Mobile 500.Begin Slideshow...

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