u get 16-17 i barely get 10 my pressure is right on at all times my tires r 285 60 r18. i havent a clue. i no it can get better maybe ill add a new duel exhaust and better intake any one have duel exhaust that is happy with wut kind should i get. i also change oil every 3k i use hile mileage and synthectic and all that good stuff.