While consumers often cite fuel savings as the primary benefit of owning an alternative powertrain vehicle, the reality for many is that the initial cost of these vehicles is too high.

Sales of clean diesel vehicles are outpacing sales of hybrids by a full 17.1 percent. Additionally, the total cost of ownership is lower for a clean diesel car. Clean diesel sales continued to reflect the surging demand for fuel-efficient models as the Audi A3 TDI and the Audi Q7 TDI accounted for 61 percent and 47 percent in their vehicle lines, respectively.