Does the PPE work super on the 6.7's as well, i love mine. My brother in law is suppose to be getting the delete from Baytown matbe this week, then he will be interested in a tuner for more milage. We made a heavy pull this past weekend to Abilene with his Cab chassis and averaged in the 8-9 mpg. It was a very big trailer with a race race and truck on it but still...