I have a 2015 that has 5400 miles on it. I have no intentions of doing any mods. I took it on a 2000 mile trip a month ago ran it 70 to 75 and averaged 27 mpg. One tank was 29.85 mpg. I have sense had a few at 30 mpg. I really like the truck first oil change put the 5w-40 oil in it. I use amsoil...