"Bill Sohl" wrote

My 2003 Chevy Silverado, 4x4, Extended cab with a 327 V8 gets about 16-17
on average.

Your engine is too small.

My 2003 Silverado 2500HD turbo-charged 32-valve 6.6L V8 gets around 21-22
MPG on the highway, and 18MPG around town.

But my 1962 Corvair turbo-charged 12-valve H-6 got only around 13 MPG, but
it was a LOT more fun to drive, and the chicks dug it!

73, de Hans, K0HB