To find the exact gas mileage for *your* 2004 Chevy Malibu Classic, you should check:
* Your owner's manual: This will have the EPA estimated MPG for your specific vehicle.
* The sticker on the driver's side doorjamb: This often contains the original Monroney sticker information, including MPG estimates.
* Online resources: Websites like fueleconomy.gov (in the US) allow you to search by year, make, model, and engine to find the EPA estimates.
Without knowing the engine size (e.g., 2.2L, 3.5L) and transmission type (automatic or manual), I cannot give you a precise answer.