 Jimmie Johnson is at the win-or-else stage of his playoff push as he hits his favorite track. Johnson has a record 11 victories at Dover International Speedway, a staggering total that started in 2002 and stretched to June 2017, a win that has stood for three-plus years as his last in NASCAR. With Dover moving one of its two scheduled NASCAR race weekends to Nashville Superspeedway next season, Johnsons mark seems unbreakable. But his farewell season could end in tatters if hes racing out the string with nothing at stake and no fans roaring from the stands. I never wanted to have a winless drought or have a winless season, Johnson said Friday. But Ive worked through so many of those emotions over the last couple of years and also understand that there are factors that I cant control that have affected my performance. Win at least one of the two Cup races this weekend at the Delaware track, and hes in the postseason. Dover, where Johnson has led 3,110 laps, is no sure shot these days for the No. 48 team -- Johnson has lost his magic touch on the Monster Mile with two finishes of 14th or worse in the last three races. Without a win, his playoff chances hang by a thread. Johnson is 25 points outside the playoff cutline with two Dover races and next weeks regular-season finale at Daytona International Speedway left to end his final full NASCAR season in the championship hunt. Yes, hes far removed from his dominant days in the Hendrick Motorsports Chevrolet, which has nudged him into the outside of the playoff field. Johnson, a 22-1 longshot, might be in a more snug position had it not been for two disastrous results: His No. 48 failed inspection in May at Charlotte, negating his runner-up finish. That cost him 45 points, a total which... 