I bought the suv about 6 weeks ago and the gas mileage didn't seem that bad . I do about 2/3 freeway and 1/3 city driving . the suv has 85000 miles . two weeeks after i bought it the fan clutch was bad so i replaced it while i aws at it i put new plugs in it . i used bosch plat +4 anyways gas milage average is 13.3 seems low any suggestions would help. also put new air cleaner in it.