Winter Blend will cost you some mileage (most regions rolled it out early this year)
Paper Filters are good for 10-15k miles
Change the fluid in your diffs, most people seem to forget it should be changed every 30k miles or every 15k under severe use.
Don't over inflate your tires, its a safety risk.
Check your U-Joints, and Hubs.
88 XJ-Lifted, Locked, and on Jackstands
69 CJ5-In peices