Johnson is Nascar's form driver with five wins from nine races
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Jimmie Johnson leads the Nascar Nextel Cup standings after winning the Nascar UAW-DaimlerChrysler 400 in Las Vegas.
Johnson led home brothers Kurt and Kyle Bush for his 15th career win and his fifth from the last nine races.
Four-time Nascar champion Jeff Gordon, who won the season-opening Daytona 500 last month, was fourth.
Kevin Harvick, who started 42nd after his team were found guilty of fuel irregularities, overcame a pit-lane speeding penalty to finish to fifth.