As of July 2003 90% of my driving (40 miles a day) can be considered highway.  Ive started driving around 60-65 since around August 2004 to raise gas mileage.

*Notes*

3-26-2002

33x12.5x15 BFG A/T with 15x10 AR-39 wheels added
(odometer/speedometer about 10% off, this means add 10% to the miles per tank column
to get the real average)

6-19-2002

KKM Air Intake

8-29-2003

Borla Hedders Added

12-5-2003

4.56 gears installed (was 3.27)
(like with the 10% problem, instead of 10%, now add 30% to the miles per tank column

1-27-2004

Odometer/Speedometer fixed no more add 10-30% issues...