NEW YORK — General Motors Co. CEO Dan Akerson said he doesn't regret the company's decision to increase spending on rebates and other deals earlier this year even though it has contributed to the company's tumbling stock price.

GM surprised the industry — and Wall Street — when it raised discounts by $400 per vehicle in January and February. Most automakers didn't raise them because demand for new vehicles has been rising in line with supply, reported msnbc.com.

"I feel pretty good about that. I think we're in pretty good shape," Akerson said at an automotive conference Tuesday in New York.

Akerson said the increased incentives helped GM sell 100,000 more cars in the first quarter than it did in the same period last year. It also caught GM's competition off-guard.

"I don't want to be a predictable competitor," Akerson said. "I don't want the other guy to know exactly what I'm doing."

GM pulled back on its incentives in March, spending $600 to $800 per vehicle less on the deals. But it was too late for some investors, who shied away from the company's stock because higher rebates lower car companies' profits.

GM's stock fell 38 cents, or 1.3 percent, to close at $29.59 Tuesday after touching its lowest point since its November initial public offering. Tuesday's closing price was10 percent below the company's $33-per-share IPO. The stock opened the year at $37.32, but has fallen 21 percent since.

That could hurt the government's effort to recoup the $50 billion it gave GM to survive. The U.S. government got back $13.5 billion from the sale of some of its shares in November's IPO. But to break even, it needs to sell its remaining shares for $53 each. The government still owns a 26.5 percent stake — about 500 million shares — in GM.

Akerson said he hasn't had discussions with the U.S. Treasury on when it might sell its remaining stake.

"They will tell us when they're getting out. I will not tell them when they're getting out, and I don't know what's going to go into their calculus," he said.

Besides the rebates, GM's stock has been hit by rising oil prices and concerns about parts shortages from Japan, Akerson said.

Akerson said that just after the IPO, GM's management team told him that higher oil prices were the biggest threat to the company. GM then put a plan in place to counter the effect of higher gas prices, including moving up the release of the new, higher-mileage Chevolet Malibu by several months.

The Malibu, which is expected to get up to 35 miles per gallon, will come out early next year.

The Energy Information Administration predicts that retail gas prices could peak at $3.91 per gallon this summer.

GM believes the March 11 earthquake in Japan will have little effect on the company. Akerson, a former telecommunications executive, said relationships he forged in that field helped him identify alternate suppliers for some electronics parts, although the company hasn't yet had to switch to new suppliers.

Investors also have expressed concern about management changes at the company. The most recent high-profile departure came April 1, when Chief Financial Officer Chris Liddell resigned after just 15 months with the company. Akerson also named a new product chief in January.

Akerson didn't directly address the changes, but acknowledged that he has taken some heat.

"If I'd changed nothing at General Motors I would have gotten criticized. If I change anything I get criticized," he said.

But Akerson said he has helped change the insular corporate culture at GM, encouraging executives to sit on the boards of companies outside the industry so they can learn other ways of doing business. He also said board meetings are more open than they used to be.

"I do think we have a more collegial, open debate and arguments. No one wants to leave the room angry. We want to solve the problem," he said.