Americans want cars that are eco-friendly. As of May 2013, green-car sales have risen 30 percent when compared with sales in 2012. The Toyota Prius remains the clear favorite among hybrid vehicle purchases, but hybrid vehicles from Ford, Lincoln and Nissan are also making a splash in this market space. Plug-in vehicle sales are on the rise as consumers seek ways of adjusting to volatile gas prices that can increase dramatically at a moment's notice.