go for a long drive somewhere, drive like a granny and accelerate slowly, no stop signs,
average speed 40-45, and calculated fillups.
tell me you do not get 21mpg, then you have a problem
21mpg is easy to get once you get 10 minutes away from the gas station and
drive 40-45mph no stops....
16MPG is quite normal running around town and doing errands, and also up and down hills
I constantly fill-up at the same pump same direction and program the scangauge
and I can get 21mpg average tank, 19-20, or as low as 14 it is all about how I decide
to drive and where I am driving. Average overall without trying is coming in at 17 or so,
but some tanks are 21.9 (all highway at 45-55mph) 21 (interstate 67mph) 19-14 bumming around town
and work commutes
hauling a dishwasher and dryer in the bed, boxes a bit above the cab, strapped in, my 21mpg interstate
drops to 17 from wind resistance and around 200lbs weight