The gas mileage for a Cadillac Escalade EXT varies significantly depending on the model year and engine. Generally, you can expect
poor fuel economy. Think in the range of
12-15 mpg combined (city and highway driving) for most model years. Highway mileage might be slightly better, but city driving will significantly lower the MPG. It's a large, heavy SUV, so this is to be expected.
To get a more precise figure, you should specify the model year and engine size (e.g., 2007 Escalade EXT with a 6.2L V8). You can then find more specific fuel economy information from the EPA's website (fueleconomy.gov) or other reliable automotive resources.
