i get 15 to 16 empty no matter if in town or on freeway and 9 to 11 no matter what i tow or where i tow it or how fast itow it. it doesnt matter if i run stock on 60 horse tow setting or 80 horse performance setting. i did lose 1 mpg when they went to ulsf. doesent even change from winter fule to summer fuel. best ever 18.1 when motor only had 700 miles on it. at 92000 now