I'm new here but not new to trucks or diesels. Had a bunch of stuff from NTC Cummins in the 70's to a Ford Tempo (Mazda) diesel to the latest ride a F-250 Super Duty 7.3 with 201000 miles. Just bought the 250 and it runs great. Would like to improve the empty mileage but not sure what direction to go.:4-dontknow: