Now big changes have been made. Starting with all 2008 automobiles, the EPA will use new testing methods that include high-speed, fast acceleration driving, the use of air conditioning, and cold weather operation at 20 degrees Fahrenheit. Using data from real-life driving studies, the Agency will also figure road grade, wind, tire pressure, load and the effects of different fuel properties into the mix to achieve mpg figures that much more accurately reflect real-world driving conditions. “It’s better info,” says EPA spokesman John Millett, adding that while the new mpg figures will be much more accurate, “it’s up to the consumer to decide the impact on their car-buying decisions.” Ideally, we’ll all choose more fuel-efficient, less polluting vehicles.