What is the gas mileage for a 88 Full Size Ford Bronco?

depends on the motor trans and tires, fill up the gas tank all the way, write down your mileage and drive normal till your next fill up, then divide the number of miles you drove by the number of gallons it takes to fill back up on your second fill up. this gives you your miles per gallon, for that tank of gas, to get a true number do this a few times and average out you findings