The NASCAR X-Finity Serieso competes on the two-mile Irish Hills oval with Saturday’s Menards 250 Presented by Valvoline, marking the mid-point of its regular season. For the X-FINITY Series, this is the first year for the post-season Chase format that’s been used by the Sprint Cup Series since 2014. There are currently sixteen drivers in the mix for the twelve spots available in the seven-race title series … There have been six different winners in the last six races run in Michigan: Logano, Kyle Busch, Paul Menard, Regan Smith, Carl Edwards and Brad Keselowski.