LAS VEGAS — Tyler Reddick stretched his final tank of fuel Saturday to win the NASCAR Xfinity Series race at Las Vegas Motor Speedway and wrap up the regular-season championship.

Christopher Bell had the most dominant car but Reddick's Richard Childress Racing team gambled on fuel strategy to beat Bell for the win. The reigning series champion has five wins this season.

Reddick had to save as much gas as possible over the final stretch and the conservation mode allowed Bell to close the gap. Bell and his Joe Gibbs Racing team were likely hoping Reddick ran out of gas, but he picked up his pace over the final four laps as Bell closed in.

Reddick made it 70 laps on his final tank of gas.

"It was stumbling," he said of the final few moments of the race.

Bell wound up second and wondered if he could have won his seventh race of the season if he had pushed harder at the start of the final run, when he had a full tank of gas. He led a race-high 154 laps.

"It's the second time this year we got beat by circumstances," Bell said. "Very, very disappointing.

The race was the final event before the playoffs begin for NASCAR's second-tier series, but the 12-driver championship field had essentially been set on points prior to the green flag. Reddick needed just 11 points to claim the regular-season title, with Bell the only driver mathematically eligible to catch him.

"What I wanted to do was get that locked up before we went and tried to win the race," Reddick said of the regular-season title. He was presented with the trophy, then stood by and listened team owner Richard Childress said Reddick's driving style reminds him of Hall of Famer Cale Yarborough.

"We ain't done yet. We got to go to Homestead and get another trophy," said Reddick, who won last year's title driving for JR Motorsports.

Brandon Jones was third, followed by Cole Custer, Justin Allgaier, Noah Gragson and Gray Gaulding.

The Xfinity Series eight-race postseason begins next week at Richmond Raceway in Virginia.

Saturday

At Las Vegas Motor Speedway

Las Vegas, Nev.

Lap length: 1.50 miles

(Start position in parentheses)

1. (4) Tyler Reddick, Chevrolet, 200 laps, 54 points.

2. (2) Christopher Bell, Toyota, 200, 55.

3. (6) Brandon Jones, Toyota, 200, 44.

4. (1) Cole Custer, Ford, 200, 47.

5. (3) Justin Allgaier, Chevrolet, 200, 50.

6. (36) Noah Gragson, Chevrolet, 200, 31.

7. (16) Gray Gaulding, Chevrolet, 199, 30.

8. (13) John H. Nemechek, Chevrolet, 199, 35.

9. (15) Riley Herbst, Toyota, 199, 0.

10. (8) Elliott Sadler, Chevrolet, 199, 27.

11. (7) Chase Briscoe, Ford, 199, 36.

12. (5) Austin Cindric, Ford, 199, 36.

13. (11) Michael Annett, Chevrolet, 199, 27.

14. (22) Ryan Truex, Chevrolet, 199, 26.

15. (10) Justin Haley, Chevrolet, 199, 23.

16. (17) Brandon Brown, Chevrolet, 198, 21.

17. (37) Alex Labbe, Chevrolet, 198, 20.

18. (29) Josh Williams, Chevrolet, 198, 19.

19. (20) Ray Black Jr, Chevrolet, 197, 18.

20. (12) Jeremy Clements, Chevrolet, 197, 17.

21. (23) Stephen Leicht, Chevrolet, 197, 16.

22. (21) BJ McLeod, Chevrolet, 196, 15.

23. (26) Garrett Smithley, Chevrolet, 196, 14.

24. (24) Matt Mills, Chevrolet, 195, 13.

25. (18) Tommy Joe Martins, Toyota, 194, 12.

26. (30) David Starr, Chevrolet, 194, 11.

27. (38) Ja Junior Avila, Chevrolet, 193, 10.

28. (28) Tyler Matthews, Chevrolet, 191, 9.

29. (32) Joey Gase, Toyota, vibration, 187, 8.

30. (34) Vinnie Miller, Chevrolet, 186, 7.

31. (31) Cj McLaughlin, Chevrolet, accident, 121, 6.

32. (25) Kyle Weatherman, Chevrolet, suspension, 66, 5.

33. (27) Joe Nemechek, Chevrolet, garage, 56, 0.

34. (33) Chad Finchum, Toyota, suspension, 52, 3.

35. (35) Stan Mullis, Toyota, garage, 22, 2.

36. (9) Landon Cassill, Chevrolet, overheating, 20, 1.

37. (14) JJ Yeley, Chevrolet, fuelpump, 2, 1.

38. (19) Ryan Sieg, Chevrolet, 199, 1.

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Race Statistics

Average Speed of Race Winner: 138.364 mph.

Time of Race: 2 hours, 10 minutes, 10 seconds.

Margin of Victory: 0.736 seconds.

Caution Flags: 4 for 20 laps.

Lead Changes: 13 among 5 drivers.

Lap Leaders: C.Custer 0; C.Bell 1-47; J.Allgaier 48; C.Bell 49-51; J.Allgaier 52; C.Bell 53-92; J.Allgaier 93; C.Bell 94-112; J.Allgaier 113; C.Bell 114-115; J.Allgaier 116-126; C.Bell 127-169; C.Briscoe 170; T.Reddick 171-200

Leaders Summary (Driver, Times Led, Laps Led): C.Bell, 6 times for 154 laps; T.Reddick, 1 time for 30 laps; J.Allgaier, 5 times for 15 laps; C.Briscoe, 1 time for 1 lap; C.Custer, 1 time for 0 laps.

Wins: C.Bell, 6; C.Custer, 6; T.Reddick, 5; A.Cindric, 2; C.Briscoe, 1; M.Annett, 1.

Top 16 in Points: 1. C.Bell, 2055; 2. C.Custer, 2044; 3. T.Reddick, 2044; 4. A.Cindric, 2017; 5. C.Briscoe, 2012; 6. J.Allgaier, 2012; 7. M.Annett, 2009; 8. N.Gragson, 2005; 9. B.Jones, 2004; 10. J.Haley, 2003; 11. R.Sieg, 2001; 12. J.Nemechek, 2000; 13. G.Gaulding, 582; 14. J.Clements, 561; 15. B.Brown, 453; 16. R.Black, 431.

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NASCAR Driver Rating Formula

A maximum of 150 points can be attained in a race.

The formula combines the following categories: Wins, Finishes, Top-15 Finishes, Average Running Position While on Lead Lap, Average Speed Under Green, Fastest Lap, Led Most Laps, Lead-Lap Finish.