The EPA estimated fuel economy for a 1987 Ford Bronco II with a V6 fuel-injected engine varied depending on the specific configuration (2-wheel drive or 4-wheel drive, automatic or manual transmission). However, you'd generally see figures in the range of
16-20 miles per gallon (mpg) combined city and highway driving.
Keep in mind that actual mileage will depend heavily on driving style, terrain, vehicle condition, and maintenance. The stated EPA estimates are just averages.