Allmendinger: I'm tired of making mistakes.

There was little anyone could do to make RuSPORT's AJ Allmendinger feel any better about his San Jose weekend after the young American crashed out of a top four position just 12 laps into Sunday's gruelling Taylor Woodrow Grand Prix.

After qualifying fourth on a track where passing was impossible, Allmendinger was running in that spot, just behind eventual second place man Paul Tracy when he became the first of several drivers to scrape the outside wall in turn four, causing enough damage to end his day on the spot.

"To say I'm disappointed is a huge understatement," said Allmendinger, who also crashed out of podium winning positions in Toronto and Edmonton. "To say that I'm tired of making those kinds of mistakes is a huge understatement. I've clearly got to fix the problem, but I'm not sure how to just yet, because these results are not acceptable."

The fact that Sunday's race was one of the toughest in recent memories didn't heal the wounds.

"I know I can drive the car fast-I qualified well, but I've got work to do," he added. "I really wanted to win this one for everyone here in San Jose, so I'm sorry I didn't bring it home."

RuSPORT team president Carl Russo tried to put Allmendinger's mistake into perspective.

"On a track that caught out even wily veterans, the San Jose Grand Prix caught out A.J. as well," said Russo.

While Allmendinger is still fifth in the championship standings with six races to go he is now more than 30 points adrift of fourth place driver Oriol Servia.