* Around 16-18 mpg city and 22-25 mpg highway for the V6 engine.
* Even lower, perhaps 14-16 mpg city and 18-22 mpg highway for the V8 engine.
These are estimates, and actual mileage will depend on driving style, vehicle condition, and other factors. You'll find better, more precise numbers in a 1992 Caprice Classic's owner's manual or on dedicated automotive resource websites like fueleconomy.gov (though that site might not have the exact 1992 model data readily available).