Its always good when Dodge doesn't even get their own advertising/engine information right. How are the salesmen supposed to even do their job
go to this page and scroll to the bottom: http://www.dodge.com/en/performance/index.html#mpg_chassis_cab

6. 7L Cummins® V8
6-Speed Manual Transmission
go to this page and scroll to the bottom: http://www.dodge.com/en/performance/index.html#mpg_chassis_cab