We have 2 Silverados with the 5.3 motor all the time as ranch trucks, we trade them about every 2 years, so have owned/driven them often.
Generally all get about 19-21 mpg on the highway, depending on load/wind. My daily commute is 56 miles round trip, about 80% highway/20% city and the average is generally between 19.5-20 mpg. (I don't drive like a NASCAR racer)
Last edited by duckster; 05/07/19.
