Great Fuel Economy!
I just recently took delivery of my 2006! XLT, Reg Cab, Long Bed, 4 cyl, 5-speed, dark shadow gray. I am aiming for 42 mpg, but my first tank was only 39.44. After the engine is broken in, and I switch to synthetic oil, the mpg will improve. To help reduce aero drag I installed an Extang tonneau cover.
The key for maximum mpg is to put lots more air in the tires, and slow down a little! I do mostly highway driving. I try to avoid or minimize use of the brakes, by looking way ahead to the next light or intersection.
So far, great truck! It's fuel capacity is 20.3 gallons, giving me about an 800 mile range. Nowhere near the range of my car, but not too bad for a 3,000 lb pickup!.................