Like every other automaker that intends to do business in the U.S., Hyundai is planning for the future and the proposed fuel economy standards that are expected to hit in 2015. Currently, Hyundai's passenger cars average 32.4 mpg, while its trucks average 25.5 mpg. When the new regulations are in place, those numbers will have to increase to 37.5 mpg and 31.0 mpg, respectively. Hyundai's approach involves two separate strategies that will work together to achieve those figures.

When the C-Class predecessor launched, it was known as the 190 and carried a four-cylinder powerplant underhood. Mercedes is now considering a return to four-pots in the U.S. market as the price of fuel continues to soar. MBZ is reportedly already testing a 1.4-liter carrying a supercharger, which is strange when you consider there's already a 1.8-liter blown four-cylinder on sale in Europe. The C180 Kompressor seems like it'd be the easy way to get fours back into the U.S. lineup, but Mercedes must have some other ideas driving the decision to develop the smaller 1.4.

Efficiency is a large stumbling block if you're looking for a way to replace gasoline. It's pretty hard to better such an exceptional fuel, and several alternatives show promise but are nagged by inefficiencies or cost, and usually both.