In only the third time in his career, Tony Stewart will have to go to a back up car for the Bristol race on Saturday. The other two times were at Chicago. Let's see ... he started racing full time in the Cup series in 1999, so thats 6 years of 36 races which would be 216 plus this year's races so far, let's say a total of 240 races, give or take, and he's had to go to a back up only 3 times? To top it off, he still ran 15th in practice. Just curious, how do those stats compare with other drivers? Anyone?