Generally expect:
* City MPG: Around 17-22 mpg
* Highway MPG: Around 26-30 mpg
To get the *exact* fuel economy figures for your specific 2007 Chevrolet Impala, check the sticker on the driver's side doorjamb or consult the owner's manual. The EPA fuel economy estimates will be listed there. Keep in mind that real-world gas mileage can vary based on driving habits, road conditions, and vehicle maintenance.