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In a session that was heavily impacted by 23 cars incurring pre-practice inspection penalties, Justin Allgaier<\/a> was fastest in Friday\u2019s first of two NASCAR Xfinity Series practices at Las Vegas Motor Speedway.<\/p>\n Allgaier covered the 1.5-mile track at a speed of 178.737 mph, followed by Kyle Busch<\/a> (178.642 mph), Tyler Reddick<\/a> (178.642), Justin Haley<\/a> (178.625) and Cole Custer<\/a> (178.536).<\/p>\n Sixth through 10th were Austin Dillon<\/a> (178.394), Christopher Bell<\/a> (177.819), Austin Cindric<\/a> (177.427), Noah Gragson<\/a> (177.282) and Zane Smith<\/a> (177.264 mph), who is making his Xfinity Series debut this weekend.<\/p>\n Those drivers penalized due to inspection issues and the amount of practice time they lost due to the penalty were:<\/p>\n Late to inspection (15 minutes):<\/strong> Jeremy Clements<\/a>, Cole Custer, Mike Harmon<\/a>, John Jackson<\/p>\n Two-time failures (15 minutes):<\/strong> Jeff Green<\/a>, Garrett Smithley<\/a>, Justin Haley, Tyler Reddick, Brandon Jones<\/a>, John Hunter Nemechek<\/a>, Christopher Bell, Stephen Leicht<\/a>, Chase Briscoe<\/a>, Josh Williams<\/a>, Vinnie Miller<\/a>, Kyle Busch, Matt Mills<\/a>, Timmy Hill<\/a><\/p>\n Late to inspection and two-time failures (30 minutes):<\/strong> Ryan Sieg<\/a>, BJ McLeod<\/a>, Ja Junior Avila, Cody Ware<\/a><\/p>\n Three-time failures (30 minutes):<\/strong> Joey Gase<\/a><\/p>\n