The upcoming Sonata has some interesting ideas for increasing MPGs. I had not thought of having an active front grill block before, but it seems like a great idea.
Quote from article:
"Hyundai says that the Sonata Hybrid is good for 36 miles per gallon in the city and 40 mpg on the highway, and the high-tech battery pack is only a portion of that story. The company's engineers have also rolled in a host of tricks to keep the fuel-economy numbers as high as possible, including what they call an "active air flap" behind that gaping hexagonal inlet in the front fascia. At low speeds, the flap is open to assist in cooling the gas engine, but once the vehicle speeds up, the flap closes to decrease the Sonata Hybrid's coefficient of drag by as much as 10 percent."
Linky