president and CEO, Petersen oversees franchises and employees. Rental fleet The Hertz rental car fleet has consisted of a variety of vehicle manufacturers, ranging from BYD, Mercedes, Infiniti, Cadillac, Land Rover, BMW, Porsche, Jaguar, Mazda, Volvo, Toyota, Jeep, and Lincoln, along with various others. By December 2012, the company had over 490,000 cars in the United States. As of 2014, 78 percent of Hertz's fleet includes vehicles that reach 28 miles per gallon or more on the highway. Specialty cars In 1966, Hertz engaged racing and automotive designer Carroll Shelby to develop an exclusive version of his modified Ford Mustang. The objective was to attract more customers to Hertz and the Hertz fleet would tempt car renters to buy a Mustang or a Shelby-Mustang. One thousand GT350H Mustangs were built as rental cars, although urban legend also maintains that many were missing original engines when returned. The "Rent-a-Racer" program was available in selected locations during the late 1960s for a limited time. The fleet has included Corvettes, Jaguar XK-Es, and AMC AMXs. In 2006, Hertz partnered with Shelby to rent specially-modified Ford Mustang GT-H Coupes as a tribute to the original 1966 Ford Mustang Shelby GT350-H. These 500 cars in 2006 were followed by convertibles in 2007. In 2008, Hertz began to rent modified Chevrolet Corvette (C6) "ZH-Z" Coupes, followed by convertibles in 2009. Hertz reintroduced the program in 2016, and includes vehicles such as Hendrick Motorsports-modified Chevrolet Corvette (C7) Stingray Z/06 and Chevrolet Camaro SS and ZL-1, and a Shelby-modified Ford Mustang GT. New technologies In 2000, Hertz introduced SiriusXM Satellite Radio to its North America rental fleet. In 2007, the company began testing hourly car rentals at three locations in New York City. It launched a global carsharing service under the name Connect by Hertz in December 2008, serving customers who paid a fee to rent cars by the hour in Park Ridge, New York, Orlando, London, Paris, and Sydney. Later branded as Hertz on Demand and Hertz 24/7, operation in the United States ceased in September 2015. In 2009, it began testing a photo system to record damage to its rental cars. It introduced ExpressRent kiosks at various rental locations in November 2011. This was the first introduction of large-scale car rental kiosks in the United States that used a live agent through video chat. The Green Collection Hertz launched its Green Collection of rental cars in