Hyundai is declaring its ambition to be a tree-hugging company. The Korean automaker announced that it will continue its efforts to be the most fuel-efficient automaker in America through the next two decades, with plans to achieve a Corporate Average Fuel Economy rating of 50 miles per gallon by 2025 for its entire vehicle lineup.

The cornerstone of Hyundai's approach is its Blue Drive strategy, which incorporates a range of engine technologies from turbocharging to direct-injection, lightweight materials and plug-in hybrids to reduce consumption and improve overall efficiency.

Hyundai points to the 2011 Sonata as the first wave of new products to utilize its new and improved drivetrains, available with either hybrid, turbocharged or naturally aspirated engines. The latest 1.6L GDI engine in the new Avante is also a shining example of Hyundai