I have had the TSB done for fuel mileage and this thing still blacks up my fender. Drove to Dallas and back yesterday got about 16. 5 mpg at 65-73. This truck cackles like my old Ford did but not as bad. Why can't the manufactures get with MB VW or BMW for the injection control. This is BS in a truck this expensive. Take it to the dealer and same ignorant statement DIESELS ALL SOUND LIKE THAT.