By Mike Spector 

AutoNation Inc. said second-quarter profit surged, as the nation's largest dealership chain rode a car sales boom expected to reach the highest levels in more than a decade.

The Fort Lauderdale, Fla.-based company reported a second-quarter profit of $115.1 million, or $1 per share, up more than 14% from $100.4 million during the same time frame a year earlier.

AutoNation's revenue rose more than 9% to $5.2 billion amid rising new vehicle sales and strong results across other business segments, including used vehicle sales, parts and service and finance and insurance. The company said net income from continuing operations hit a record.

Still, AutoNation's results missed Wall Street expectations. Analysts polled by Thomson Reuters expected AutoNation to earn $1.02 per share. AutoNation shares fell more than 3% in early morning trading to below $63.

But the dealership chain's stock has more than tripled since the worst of the financial crisis in 2008, when auto sales plunged and some auto makers were forced to take government rescues and seek bankruptcy protection. "The trend line is what I look at," Chief Executive Mike Jackson said in an interview.

Mr. Jackson downplayed the fallout from two hackers' public display this week of their ability to commandeer a moving Jeep's air conditioning, brakes and engine from a laptop miles away. The hackers said they aimed to raise awareness of vulnerabilities in Internet-connected cars. "The industry absolutely has very robust encryption protection around vehicles," Mr. Jackson said. "I have no hesitation getting in my cars."

AutoNation's rising profits reflect low interest rates and gas prices that are spurring a torrid pace for auto sales. Mr. Jackson said the company expects new-vehicle sales to surpass 17 million for the full year, a level not seen since 2001. The dealership chain's new-vehicle sales rose 6% during the second quarter, bringing in nearly $3 billion in revenue.

Lithia Motors Inc., a Medford., Ore., dealership chain, on Tuesday reported financial results that beat expectations, further underscoring the revved-up market for cars in the U.S.

With interest rates low, dealerships are able to offer longer-term financing, broadening the range of buyers who can afford a new car. AutoNation also cited broader pent-up demand for new cars, with the average vehicle on U.S. roads more than 11 years old. Lower gas prices, meanwhile, are padding consumers' pockets.

Lower fuel prices are also spurring consumers to buy larger, less-efficient pickup trucks and sport-utility vehicles that typically deliver higher margins for auto retailers than passenger cars. Light-truck sales were up 9% during the second quarter, according to Wells Fargo & Co. Expensive luxury vehicles, too, have been selling well, helping boost dealers' bottom lines.

"There is more installed capacity in passenger cars than there are people to buy them," Mr. Jackson said. He predicts low gas prices will persist, challenging auto makers that need to sell fuel-efficient cars to meet stringent government mileage and emissions regulations. "We're in a new era for a while," he said of lower fuel prices, adding that the trend makes selling hybrids and electric cars difficult.

Mr. Jackson said AutoNation completed six months ahead of schedule the first phase of an online program called AutoNation Express that allows customers to reserve and put deposits down on vehicles. More than 20% of the dealership chain's sales were generated from its own websites during the first half of 2015, he said.

Mr. Jackson made waves earlier this month when he cut ties with TrueCar Inc., an online car-buying site. Mr. Jackson hopes to bolster AutoNation's online shopping capabilities to reduce reliance on third parties on sales and cut down on time spent in the dealership.

AutoNation is also on the front lines of widespread safety problems affecting the U.S. auto industry, especially with vehicles featuring rupture-prone air bags manufactured by Takata Corp. of Japan. The dealership chain completed more than 20,000 Takata-related recalls in the second quarter. The company expects over the next several years to replace an additional 400,000 air bags at AutoNation dealerships.

Mr. Jackson reiterated his support for the terms of a settlement between American Honda Finance Corp. and the Consumer Financial Protection Bureau and U.S. Justice Department on allegations of discriminatory lending practices. He called the terms, which involve capping dealers' markup of interest rates, a "workable template" that other car retailers should follow. "CFPB is here to stay, this issue is here to say," Mr. Jackson said.

Write to Mike Spector at mike.spector@wsj.com

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