EcoLogic

If you’ve purchased a new car in the U.S. over the past few years, the chances are you’ll be familiar with the gas mileage stickers that automakers are required by law to display in the window of each new car. But visit a Chevrolet dealer this year, and you’ll see 2012 Chevrolet Sonics sporting not one, but two window stickers. Alongside the recently-redesigned and legally-required EPA gas mileage sticker -- which displays official EPA gas-mileage figures and estimated fuel costs based on 15,000 miles of driving per year -- all 2012 Chevy Sonics will feature General...