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As I'm sure you know, there are a lot of things that have an effect on the mileage. Most Broncos get between 9 and 13 MPG. If you are hitting in that range you are doing average. If you are below that, start with a basic tune up. If you are above that say thanks [-o<does anybody know what i should get for gas mileage on a 88 bronco with the 4.9 liter 6cly