Lock your doors, Cadillac Escalade owners. A new study from the Highway Loss Data Institute named Cadillac's flagship SUV the most-stolen vehicle in the US, finding the Escalade is six times more likely to be stolen than the average vehicle.

Topping the HLDI's most-stolen list is the Cadillac Escalade EXT, which features four doors and a pickup bed. The HLDI says the Escalade EXT is a whopping eight times more likely to be stolen than the average vehicle, with 14 claims per 1,000 insured vehicle years.

The news should come as no surprised to Escalade owners, since the SUV has been featured at the top of the HLDI's most-stolen list for several years. It also comes as no surprise to General Motors, the Escalade's manufacturer, as the automaker immediately announced revisions to the 2012 Escalade that make it more difficult to steal. Such updates include a more robust steering column lock system, an optional inclination sensor that senses a change in the vehicle's angle and a wheel lock system designed to prevent theft of the Escalade's wheels and tires.

"We are currently implementing four new pieces of ?armor' on Escalade intended to reduce vehicle thefts," said Bill Biondo, GM's global lead of vehicle theft prevention. "We are committed to beating the thieves and expect these new theft deterrent systems to greatly reduce the Escalade's rate of theft and lower its position on HLDI's list."

Of course, the Escalade isn't the only vehicle targeted by thieves. Other models near the top of the HLDI's most-stolen list include a series of large domestic vehicles such as the Ford F-250, F-350 and F-450, Chevrolet Silverado and GMC Sierra 1500, Chrysler 300, Chevrolet Avalanche and GMC Yukon.

Along with its study on the most-stolen vehicles, the HLDI also announced vehicles with the lowest claim rates. Topping the list is the Audi A6, which is less than a third as likely to be stolen as the average vehicle, followed by the Mercury Mariner, Chevrolet Equinox, Volkswagen CC, Lexus RX350, Saturn Vue, Chevrolet Aveo, BMW 5 Series and Mini Clubman.

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Jeffrey Archer is fortunate to have turned a passion for cars into a career. His wide-ranging automotive experience includes work for automakers and dealers in addition to covering the news. When not writing, he spends his time searching for unique cars on AutoTrader.com.

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