With my Stg I 160 cc squirts and the wildman chip set to an economy tune I was easily getting 18-19 mpg highway. And with a flip of the dial I was leaving SD's, duramaxs and cummins in the soot. In the tow tune I could hold very reasonable EGT's while towing a 26' TT at 70+ mph up and down grades throughout the Rockies while still getting 12-14 mpg.