Unfortunately, I can't divulge mpg on any of our RVing setups over the 3 decades we have been enjoying our favorite pastime, just never mattered enough for us to know. Additionally, we live in the mountain west and getting up and down the roadways and safely to our destination is our only concern. Our current rig tracks mpg as well as our scangauge 2, again never took the few minutes to view this information as it is meaningless to us. From what I have heard from friends, family, and fellow RVers is gassers give 4-8 mpg, and diesels 7-12 mpg, speed of travel is the main component for expected mpg on any type of rig.