Updated aero package that will be used for the Aug. 29 Cup Series regular season finale at Daytona is another effort by NASCAR to combat fuel-saving at superspeedway events, particularly at Daytona and Talladega.

Williams chief technical officer Pat Symonds has no doubts that his team has the same-specification engine as the works Mercedes Formula 1 squad.Comments made by driver Felipe Massa during the Australian Grand Prix weekend had been interpreted as hinting that Williams did not have the same 1.6-liter V6 hybrid turbo...