In my paper, I utilized the Berry logit framework and data on year 2006 vehicle registrations to estimate three sets of automobile demand functions. These demand functions varied in scope, covering the overall market, the hybrid market, and separate vehicle segments. I found that primary determinants of demand are relatively similar between the overall market and hybrids, but that they vary wildly among class-based vehicle segments. Horsepower per ten pounds, fuel efficiency, and weight have a relatively consistent and strong effect on demand in the overall market, the hybrid market, and several vehicle segments. The sports car segment in particular returns a high priority on fuel efficiency, although it is unsurprisingly overshadowed by a much stronger preference for horsepower