My truck in the sig gets 19-19.5 at 2k rpm or 70 mph ish. I have a friend who claims his 02 d-max gets 22 mpg on the highway. Both are cc sb and fwd. He runs some sort of edge product. My current numbers were with my old DP chip. My truck sits higher. He has a tonneau cover and I have a cab with a slight bump. My numbers are with the stock 265s and he had 245s. I wonder if it is just that his truck looks way less stout.