SONOMA, Calif. -- Scott Dixon had the right fuel strategy, again.

IndyCar's master of saving fuel delivered his first win of the season Sunday at Sonoma Raceway as the series prepares for a championship fight next weekend at Auto Club Speedway in Fontana, Calif.

The title is still at stake because series leader Will Power stunningly spun in Turn 7 on Lap 41. He had led 33 laps to that point.

Power fought back to pass Team Penske teammate Helio Castroneves in an exchange of pit stops and trouble all day by the Brazilian. Castroneves dropped back all the way to finish 20th.

Power finished 10th, extending his lead over Castroneves to 51 points.

"It was a good recovery there," Power said.

Power all but eliminated everyone but Castroneves as Simon Pagenaud, who finished third in the race, is 81 points back. Pagenaud will be eliminated once Power starts the race.

The championship will be Team Penske's first since 2006.

Ryan Hunter-Reay, who finished second, leads the group of drivers that has been eliminated.

Castroneves' race was botched almost from the start. He got caught in the Turn 2 bottleneck created by Sebastien Bourdais and Ryan Briscoe having contact and veering to the dirt on the left side.

Castroneves ran into the back of James Hinchcliffe, and they both got turned sideways. Castroneves then took lighter contact from behind from rookie Carlos Munoz. After the front wing was replaced on pit road, Castroneves was 19th among 22 in the field. He lost three more positions when he pitted on Lap 9 to have a broken right rear bumper cut off.

That wasn't even the last of Castroneves' troubles. On a restart on Lap 36, the Brazilian tried to go three-wide with Bourdais and Sebastian Saavedra in the tight Turn 7. That didn't work. Castroneves bumped Bourdais and Saavedra spun. Briscoe then hit Saavedra to bring out the full-course caution.

Power and Castroneves started the day jostled in their downtown Napa hotel, located only about 10 miles from the earthquake's epicenter.

"Will thought it was the end of the world, I thought it was a plane crash," Castroneves said. "It was this rumbling noise, and it completely trashed the bathroom. It was like a movie, and I was in it.

"A very scary moment. I'm still shaking."

Evacuation followed, leaving the drivers no alternative than to head to the track for an early morning arrival.

Power said it wasn't a major problem, "but I'll sleep well tonight."

Meanwhile, CNN reported at least 90 people injured, three critically, and a state of emergency was issued for Napa, which is about 20 miles northeast of the track.

"All these things falling on the floor, mirror breaking in the bathroom, you hear the alarms, pipes (breaking), not a single picture moved," Castroneves said. "I want the guy who put those nails in to come to my house."

Almost everyone associated with the event spoke of the noise associated with the tremor that emanated from American Canyon, a town just north of Vallejo, where Jeff Gordon hails from.

One driver who missed the action was Josef Newgarden, who admitted he slept through the bumps.

"I didn't know anything had happened and then my (friend) said, 'We should probably go to the track a little earlier in case there are problems,'" he said. "I said, 'What problems?'"

Track president Steve Page said the decision to continue with the event was based on the fact there were no logistical issues -- no damage to the track or the facilities -- and the roads were open.

Coincidentally, the event seemed to draw one of its largest crowds in recent years although the official attendance was not released.

NOTES: Josef Newgarden, who qualified second, signed a one-year deal with the merged teams currently known as Ed Carpenter Racing and Sarah Fisher Hartman Racing. The new team will be known as CFH Racing and will give Newgarden a teammate for 2015. ... Jack Harvey dominated both season-ending Indy Lights races at Sonoma Raceway, but he couldn't shake Gabby Chaves for the series championship. Chaves finished second in the finale, the position he needed. The two drivers tied in points and race wins (four), but the Colombian had more second-place finishes (five to one). ... Winning the title earned Chaves a $750,000 scholarship to apply toward an IndyCar Series ride next year, which all but assures him a chance at the Indianapolis 500.