460 gas mileage improvements
79 f-3504x4 460 nv4500 trans 4:10 gears 33-12.50-16.5 tires anybody getting anything above 9.1 mpg? changed holley 600cfm carb to holley 750 cfm carb. 8.6 mpg -600cfm to 9.1 mpg-750cfm with#72 jets stock cam performer 460 manifold dual exhaust. truck regularly pulls 16ft. horse trailer with horses. any tips besides 12 valve cummins engine swap?