A new study suggests that two-thirds of all adult car owners who own a digital audio player -- such as Apple's iPod -- also use the device in their car. Additionally, 14 percent of all adult car owners are looking for some kind of digital audio player integration in their next car purchase, and would vastly prefer stereos with direct interfaces to commonly used cassette adapters and FM tuners, according to electronista. The study by Harris Interactive concludes that car and stereo manufacturers need to focus on better integration to make buyers truly happy.