Great fuel mileage...

[Maxtor]

I never drive over 2000 rpms.
I never accelerate like a gasser or ricer.
I maintain steady speed.
I have stock size tires @ 60 psi.
I have the best pure highway tread tires IMO...Michelin XPS Rib
I have Redline synthetic ATF in my tranny.
I have Redline synthetic 75W90 in my rear differential.
I have an econo setting on my chip.
I use cruise control.

AND, it's a reg cab 4WD w/ a 4.10 rear...NOT a crew cab dually.

ON EDIT: That 20.2 mpg was on 100% #2...which I no longer use. My current mpgs on bioD & wvo are much less.

I think you get great mileage with the 4.10 gears. I basically drive like you do, except I have a s/c and 3.73 gears. and
stock tires @ 70 psi
original continental tires
manual trans, with stock fluid
all stock fluids
no chip

 

[strokepower]

i got 14.4 on the last tank and that is pretty decent considering im still a kid and floor it everytime i take off....i just love the smoke...what can i say