Editor's note: Earlier versions of this story contained an incorrect statistic from NHTSA on its 2011 preliminary theft rate. The agency today has revised and corrected its figures. This story now reflects those changes.
WASHINGTON -- The most theft-prone vehicle in America might be the Dodge Charger. Or it might be the Ford F-250 pickup truck.
Those are the contradictory conclusions of the National Highway Traffic Safety Administration and the insurance industry-funded Highway Loss Data Institute.
Still, the government agency and private group agree that the theft of late-model vehicles is on a rapid decline in the United States. One reason: automakers' increasing use of ignition immobilizers, which stop thieves from hot-wiring cars. Nearly 90 percent of 2012 models are equipped with them.
In a report released on Monday, NHTSA said the car stolen most often during the 2011 calendar year was the Charger, with 4.8 thefts for every 1,000 cars produced in 2011. It was followed by the Mitsubishi Galant, Hyundai Accent, Chevrolet Impala and Chevrolet HHR among vehicles with more than 5,000 units produced that year.
Pickup trucks took the top five places in dueling rankings released today by HLDI, an affiliate of the Insurance Institute for Highway Safety. In first place was the Ford F-250 crew-cab with four-wheel drive, followed by the Chevrolet Silverado 1500, Chevrolet Avalanche 1500, GMC Sierra 1500 crew, and Ford F-350 crew with four-wheel drive. The rankings cover model years 2010 to 2012.
The Cadillac Escalade, long the most theft-prone vehicle according to HLDI, dropped to sixth place after GM reworked the SUV to thwart thieves.
"General Motors has put a lot of effort into new antitheft technology, so that may help explain the decline," Matt Moore, vice president of the group, said in a statement.
GM spokeswoman Sharon Basel said the Escalade -- which was lower on the HLDI list than in the past -- has received several major anti-theft upgrades, many of which were implemented for the 2012 model year. The SUV is now equipped with the PASS-Key III+ system, which offers more sophisticated encryption for the key and key cylinder.
An inclination sensor is also available as an option to prevent push-away thefts, where a thief may try to tow a vehicle away. The sensor sets off an alarm following an unwarranted change of the vehicle's angle from the ground. In equipped vehicles, OnStar can also remotely block the ignition or slow down cars if they're reported stolen.
In regards to other vehicles on the list, Basel said GM has an engineer who works with law enforcement to understand criminal trends and educate officials about anti-theft systems currently on the market.
"This is a full-time process. We look at this with seriousness because it impacts our customers," Basel said. "This is not something that is stagnant, there is constant change in this and updates to deterrent systems that need to take place."
A Ford spokeswoman said in a statement that the company's vehicles, including the F-Series trucks, offer the latest in anti-theft technology, including SecuriLock, a standard feature that prevents vehicles from being started without keys that contain a unique computer chip.
"Ford continually monitors the performance of its vehicles and is confident locking mechanisms work properly in all of our vehicles," the spokeswoman said. "But, like any lock, thieves can overcome them."
The two reports produced separate results because of differences in methodology, Moore said during an interview. His group bases its rankings on a database of insurance claims, while NHTSA counts thefts reported to police.
Moore said large pickup trucks are also particularly prone to theft claims because owners can recoup the cost of equipment stolen from the flatbed.
Still, the two groups can agree on some of their findings -- including that the Charger is stolen more frequently than most vehicles. While the muscle car did not make the top 10 most stolen models according to HLDI, the group found that it had 3.5 theft claims per 1,000 years of insurance coverage, or triple the average model.
"Customer security is paramount at Chrysler Group," Chrysler said in an e-mailed statement. "Accordingly, features such as engine immobilization have been available on many models -– including the Dodge Charger -– for several years. Further testament to the Charger's security is its popularity as a police vehicle."
Experts are not exactly sure what makes the Charger so popular with thieves, although the car's ample horsepower might be part of the equation.
"If I were a thief I might be able to answer that better," Moore said during a phone interview. "They're powerful vehicles," he added.
Lower theft rate
NHTSA says its preliminary data show that model-year 2011 vehicles were stolen that calendar year at rates 15.4 percent lower than the year before.