take foot off gas, take off easy, start braking well before stoplights/brakes, etc.
there are really no items you can add that will help you regardless of all the hype. since your truck is no new, there really isnt anything that you can replace either.
here is my fual tracking, as you can see, its not that great (click on badge)
just follow their gas saving tips except for the cold air intake one because it does nothing for a Ranger http://www.fuelly.com/tips/
2006 Toyota 4Runner Sport 4x4
Clarion CX501 Double Din | 265/70/17 BFG A/T | Remote Start | Tinted Windows | TRD Exhaust | TRD CAI |4.0 V6 |Tow Package | Titanium Metallic
SOLD: 2006 Ranger XLT Supercab 4x4 | The "Original Mr. Clean"
Yes I drive a Toyota 4Runner now, Yes this is a Ranger forum, get over it, the Ranger couldn't fit my child, but I do miss it.