my 04 gmc sierra extended cab 4x4 gets an about 15-17 mpg round town,
rteally havent taken it on road trip to know what it gets there.
i drive 35 miles one way to work at a speed of about 55 to get this
i have the 5.3 engine.
my range meter when i fill up says i can go 450-490 miles per tank, 26