I.m looking around at motors and was wondering what kind of fuel milage do you all get? I know that driveing habits varry greatly cummins has an artical out that states that there can be as much as a 30% differance between the most and least eficien drivers. but in general what do you all get?? and what do you thnink is the most efient generation of cummmins/? thanks for you r time J