Lap by Lap: Fontana

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Lap 250: Biffle wins the Auto Club 500. Jimmie Johnson passes Kurt Busch for second.

Lap 238: Jeff Gordon is slowing down. Gets black-flagged.

Lap 234: Matt Kenseth cuts a right front tire. Race stays green.

Lap 228: Greg Biffle takes lead from Kurt Busch

Lap 222: Green flag. Kurt Busch leads.

Lap 218: Kurt Busch, Greg Biffle, Mark Martin and Rusty Wallace stay out. The rest of the leaders pit. Kevin Harvick takes four tires and Jeff Gordon takes two. Jamie McMurray leads the pack off pit road and will restart fifth.

Lap 217: Caution is out for Jason Leffler's blown engine

Lap 215: Kurt Busch to second

Lap 210: Green flag. Kevin Harvick leads.

Lap 208: Gas will be an issue if race goes green-white-checkered

Lap 204: Leaders on pit road. Kevin Harvick retains the lead, Matt Kenseth to second and J. Gordon is third. Carl Edwards gets stuck in pit road traffic and goes from third to 10th.

Lap 203: Caution out for Michael Waltrip's blown engine

Lap 202: Jeff Gordon to second

Lap 195: Harvick takes lead from Edwards

Lap 194: Edwards leads Harvick by .2 seconds

Lap 186: Jeff Gordon passes Rusty Wallace for fourth

Lap 182: Nemechek to the garage

Lap 180: Nemechek makes unscheduled pit stop.

Lap 179: Edwards takes lead from Nemechek

Lap 178: Carl Edwards is in second, 0.2 seconds behind Nemechek

Lap 173: Nemechek has led 58 laps, Kenseth has led 57.

Lap 166: Nemechek takes lead from Johnson.

Lap 165: Green flag. Johnson leads.

Lap 161: Jimmie Johnson takes the lead with a gas-and-go stop. Nemechek takes two tires. Mark Martin takes four tires. Rusty Wallace comes off pit road in third.

Lap 160: Caution out for Kasey Kahne crash. Ryan Newman gets the Lucky Dog pass.

Lap 160: Nemechek leads Johnson by 1.6 seconds

Lap 157: Ricky Rudd to the garage

Lap 156: Scott Riggs slowing dramatically -- has fallen to last car on the lead lap.

Lap 153: 26 cars on the lead lap

Lap 151: Green flag. Nemechek leads. Ryan Newman is the first car a lap down.

Lap 144: Leaders on pit road. Nemechek wins the race off road. Martin is second and Johnson is third.

Lap 143: Caution out for Dave Blaney crash. Kurt Busch gets the Lucky Dog pass.

Lap 140: Nemechek leads Johnson by 2.7 seconds

Lap 138: Kurt Busch goes a lap down

Lap 136: Dale Earnhardt Jr. on pit road again. The hood is up.

Lap 126: Jeff Green has a cut left rear tire. Race stays green.

Lap 121: Nemechek leads Johnson by 2.5 seconds

Lap 117: Johnson takes second. Harvick up to third.

Lap 114: Green flag. Nemechek leads.

Lap 108: Leaders on pit road. Nemechek's crew gets him out by a nose ahead of Kenseth. Mark Martin stays out and leads a lap.

Lap 107: Caution is out for debris. Kurt Busch is caught in the pits but will be able to remain on the lead lap.

Lap 105: Green-flag stops are beginning. Leffler caught speeding on pit road.

Lap 105: Three (Kenseth, Martin, Edwards) of the top five are Roush Racing cars

Lap 104: 29 cars on the lead lap

Lap 100: Ryan Newman and Kyle Busch make unscheduled pit stops. Busch has right-side damage from slapping the wall and Newman has a cut tire.

Lap 100: Kenseth leads Nemechek by 1.7 seconds

Lap 92: Kenseth leads Nemechek by one second

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Lap 85: Bobby Hamilton Jr. and John Andretti trade paint. Andretti pinched against the wall -- no caution.

Lap 82: 37 cars on the lead lap

Lap 77: Kenseth leads Nemechek by 0.6 seconds

Lap 69: Kenseth takes lead from Edwards. Nemechek to second,

Lap 68: Edwards takes lead from Kenseth.

Lap 67: Green flag. Kenseth leads.Edwards is second and Nemechek is third.

Lap 64: Green pits and gives the lead to Kenseth.

Lap 63: Mayfield pits and Green leads a lap.

Lap 61: Leaders in for pit stop. Jeff Green and Jeremy Mayfield stay out. Mayfield will be scored as the leader. Kenseth -- again -- is the big winner in the pits.

Lap 59: Caution is out again for debris as Dale Earnhardt Jr. has to return to pit road for another cut tire.

Lap 53: Casey Mears makes unscheduled pit stop. Mears will lose at least one lap.

Lap 52: 38 cars on the lead lap

Lap 48: Randy Laoie to the garage

Lap 47: Carl Edwards takes lead from Matt Kenseth

Lap 38: Dale Earnhardt Jr. making unscheduled stop to repair a flat left front tire. He will go at least a lap down.

Lap 35: Kevin Lepage to pit road.

Lap 34: Joe Nemechek to second

Lap 31: Kenseth takes lead from Lajoie.

Lap 31: Green flag. Randy Lajoie leads.

Lap 27: Leaders on pit road. Matt Kenseth takes the lead with a brilliant stop. Biffle comes out second. Three cars (Kyle Petty, Mike Wallace and Randy Lajoie) stay on the track. Jimmie Johnson and Jason Leffler nearly collide in the pits.

Lap 26: Caution is out as Bill Elliott's car has spun and come to a stop against the wall.

Lap 23: Bill Elliott goes a lap down

Lap 21: Carl Edwards has gone from 19th to fourth

Lap 18: Ricky Rudd is six laps down. The rest of the field is on the lead lap.

Lap 17: Biffle leads Kenseth by 2.4 seconds

Lap 10: Matt Kenseth takes second

Lap 7: Ricky Rudd to pit road with right side damage after colliding with Bill Elliott. Race stays under green. Rudd will ge at least a lap down.

Lap 7: Carl Edwards, who started 19th, already 10th

Lap 6: Matt Kenseth takes third

Lap 4: Greg Biffle takes lead from Kyle Busch

Lap 3: Kyle Busch takes lead from Brian Vickers

Lap 3: Brian Vickers takes lead from Kyle Busch

Lap 1: Kyle Busch leads from the Bud Pole. It is the first lap led in his brief career.

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