Pretty much all highway, 4.5 gallons took me 90 miles. so 20? Jeebuss, reall? Huh.. Need to top off and get past this SOTP/fuel gauge approximation BS I call mpg... but straight up eighth, added $18 in diesel went 75 read miles, 90 in reality.. (speedo is off, mulitply everything by 1.2 and dead...