Just purchased a 99 XLT4x4...oversize tires etc. I love the truck...my first tank 100 canadian litres...got me an impressive 325 miles....about 16.5 miles to the gallon..combo of city and highway driving too..I have to admit that I kept it under 2000 RPM the entire tank with a few moments of power tripping..no mods at all. Truck does have 67000 k on it...engine runs well though...gotta love it.

 

4.2? 4.6? 5.4?

 

Sorry about that....its a 5.4...

 

not too shabby.