DETROIT - AUGUST 29: Will Power drives the #8 Team Australia Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29: Scott Dixon drives the #9 Target Chip Ganassi Racing Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29: Buddy Rice drives the #15 Dreyer & Reinbold Racing Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29: Bruno Junqueira drives the #18 Dale Coyne Racing Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29: Tomas Scheckter drives the #12 Luczo Dragon Racing during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

Andretti Green Racing teammates Tony Kanaan, right, and Danica Patrick, left, get a feel for the Detroit Belle Isle Grand Prix race course Friday, Aug. 29, 2008, in Detroit.

DETROIT - AUGUST 29: Marty Roth, driver of the #25 Roth Racing Dallara Honda, is turned to face the right direction on the track by safety crew members after spinning out during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29: Ed Carpenter drives the #20 Menards Vision Racing Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29: Dan Wheldon drives the #10 Target Chip Ganassi Racing Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29: Helio Castroneves drives the #3 Team Penske Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29:Graham Rahal drives the #06 Newman Haas Lanigan Racing Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29: Scott Dixon at speed driving the #9 Target Chip Ganassi Racing Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

Andretti Green Racing driver Tony Kanaan, left, talks with racing engineer Eric Cowdin after their morning practice for the Detroit Belle Isle Grand Prix auto race Friday, Aug. 29, 2008, in Detroit. Kanaan won the race last year.

DETROIT - AUGUST 29: Dan Wheldon drives the #10 Target Chip Ganassi Racing Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29: Hideki Mutoh drives the #27 Formula Dream Andretti Green Racing Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

Andretti Green Racing driver Danica Patrick talks with race engineer Martin Pare, right, after their afternoon practice session on the Detroit Belle Isle Grand Prix race course Friday, Aug. 29, 2008, in Detroit.

Andretti Green Racing driver Danica Patrick talks with race engineer Martin Pare, left, after their afternoon practice session on the Detroit Belle Isle Grand Prix race course Friday, Aug. 29, 2008, in Detroit.

DETROIT - AUGUST 29: Helio Castroneves drives the #3 Team Penske Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29: Danica Patrick drives the #7 Motorola Andretti Green Racing Dallara Honda car during practice for the IRL IndyCar Series Detroit Grand Prix on August 29, 2008 at the Raceway on Belle Isle in Detroit, Michigan. (Photo by Marc Serota/Getty Images)

Team Penske driver Ryan Briscoe, left, talks with race engineer Tom German after taking practice laps for the Detroit Belle Isle Grand Prix race Friday, Aug. 29, 2008, in Detroit.

Andretti Green Racing team driver Danica Patrick prepares for her practice laps on the Detroit Belle Isle Grand Prix race course Friday, Aug. 29, 2008, in Detroit.

DETROIT - AUGUST 29: E.J.Viso drives the #33 HVM Racing Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29: Tomas Scheckter drives the #12 Luczo Dragon Racing during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29: Marco Andretti drives the #26 Andretti Green Racing Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29: Hideki Mutoh drives the #27 Formula Dream Andretti Green Racing Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29: Scott Dixon drives the #9 Target Chip Ganassi Racing Dallara Honda car during practice for the IRL IndyCar Series Detroit Grand Prix on August 29, 2008 at the Raceway on Belle Isle in Detroit, Michigan. (Photo by Marc Serota/Getty Images)

DETROIT - AUGUST 29: Helio Castroneves drives the #3 Team Penske Dallara Honda car during practice for the IRL IndyCar Series Detroit Grand Prix on August 29, 2008 at the Raceway on Belle Isle in Detroit, Michigan. (Photo by Marc Serota/Getty Images)

DETROIT - AUGUST 29: Tony Kanaan drives the #11 Team 7-Eleven Andretti Green Racing Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

DETROIT - AUGUST 29: Ryan Briscoe drives the #6 Team Penske Dallara Honda during practice for the IRL IndyCar Series Detroit Indy Grand Prix on August 29, 2008 at The Raceway on Belle Isle in Detroit, Michigan. (Photo by Darrell Ingham/Getty Images)

In this Friday, Aug. 22, 2008, file photo, IndyCar Series driver Scott Dixon gets ready for practice laps for the Grand Prix of Sonoma auto race at Infineon Raceway in Sonoma, Calif. If Dixon can hang on and win the championship the season, he's going to appreciate this one a whole lot more than the title he took five years ago as an IndyCar Series rookie.