I get about 16.5 running around town, and 19.5 on the highway doing 78-80 MPH with nothing behind the truck. When im doing 80 I turn about 2000 RPM. Mine is a 07.5 Mega Cab Laramie 3500 Dually 2 WD. You can see my signature below to see what i got for the truck. I couldn't tell you what i get for HP and Torque, but if i took to most educated guess i would say 450 HP and 800 LBS to torque with the 70HP economy tune from Anarchy Diesel. Hope this helps out, sorry not too familiar with the Smarty Jr. But i would talk to Phil from anarchy Diesel if you have not got a turner yet. Oh yeah, and all my mileage is hand calculated, i used to get about 12 and 16 before i put all the goodies on.